Disclosed herein are computer-implemented method, computer-readable storage medium, and DAW embodiments for implementing a music composition aid. An embodiment includes retrieving a first constraint value, receiving a selection of a set of musical elements, and accepting a second constraint value corresponding to the set of musical elements. Some embodiments further include invoking an iterator function, using at least the second constraint value as an argument, and generating an output of the iterator function, limiting a size of the output of the iterator function, according to the lesser of the first constraint value or a transform of the second constraint value. Output of the iterator function may include, of the set of musical elements, a subset determined by the second constraint value. The size of the output may be no more than the first constraint value. Further embodiments may render the output of the iterator function visually and/or audibly, for example.

An accordion includes a right hand play side, a left hand play side, a bellow provided between the right hand play side and the left hand play side. A plurality of columns of buttons provide on at least one of the right hand play side and the left hand play side. Each of the plurality of columns may have at least three buttons to which three single pitches are assigned, the three single pitches constituting a triad major chord. Embodiments of the present invention provide a user-friendly system for accordionists that can also cover more than 90% of the accordion songs being public in the world.

Gaze enrollment, including displaying an enrollment progress user indicator, animating movement of user interface elements, changing the appearances of user interface elements, and/or moving a user interface element over time, enable a computer system to more accurately track the gaze of a user of the computer system

Gaze enrollment, including displaying an enrollment progress user indicator, animating movement of user interface elements, changing the appearances of user interface elements, and/or moving a user interface element over time, enable a computer system to more accurately track the gaze of a user of the computer system.

An environment awareness system includes a memory and first and second modules. The memory is configured to store environmental data, one or more music composition templates, and one or more maps, where the environmental data is indicative of at least one of a state, condition, or change in an environment in which the environment awareness system is located. The first module is configured to receive and store the environmental data in the memory. The second module is configured to: based on the one or more music composition templates and the one or more maps, convert the environmental data to a music signal including modifying variables in the one or more music composition templates based on the environmental data; and based on the music signal, play out a musical composition via an audio system to audibly indicate the at least one of the state, condition, or change in the environment.

Real-time jamming is automatically assisted for musicians. A real-time audio signal is received of played music that is played by at least one person. Beat is tracked of the played music from the real-time audio signal and accordingly a time of a next beat is predicted. At least one of chords; notes; and drum sounds is recognized from the real-time audio signal and repetitions in the played music are accordingly detected. A next development is predicted in the played music, based on the detected repetitions, including at least one of chords; notes; and drum sounds that will be played next, and respective timing based on the predicted time of the next beat. A real-time output is produced based on the predicted next development in the played music.

To assist a human player in performing a foot operator group (pedal keyboard) including a plurality of foot operators operable with a human player's foot, a foot operator image indicative of the foot operator group is displayed on a display screen. Model performance data each designating a pitch to be performed are sequentially acquired, and it is determined whether the pitch designated by the acquired model performance data should be performed by use of the foot operator group. Upon determination that the designated pitch should be performed by use of the foot operator group, a particular foot operator corresponding to the designated pitch is visually designated on the displayed foot operator image (for example by adding a marker image to the particular foot operator). Thus, the human player can easily operate the foot operators while visually confirming, on the foot operator image, each foot operator to be operated.

To assist a human player in performing a plurality of foot operators (pedal keys) operable with a human player's foot, a foot operator image indicative of the foot operators is displayed on a display screen. Model performance data including at least information indicative of a rhythm and a pitch of a foot performance part to be performed by use of the foot operators is acquired, and a particular foot operator corresponding to the pitch of the foot performance part included in the acquired model performance data is visually designated. At the same time, based on rhythm information for the foot performance part, a rhythm of a sound corresponding to the particular foot operator is presented. The presentation of the rhythm is performed by presenting a sound generation timing and a time length of the sound, and a suitable marker indicative of a performance progression may be additionally displayed.

To assist a human player in performing a plurality of foot operators (pedal keys) operable with a human player's foot, a foot operator image indicative of the foot operator group is displayed on a display screen. Chord information of a chord to be performed is acquired, and a pitch of a bass note corresponding to the chord indicated by the acquired chord information is identified. A particular foot operator corresponding to the identified pitch of the bass note is visually designated on the foot operator image displayed on the display screen. An object indicative of a chord name is displayed on the same display screen. Objects indicative of one or more chord names corresponding to a chord progression over a plurality of measures is displayed. A display object highlighting one object indicative of a particular chord name is added in accordance with a progression of a performance.

A music composition, editing, and playback system and method provides a user interface design based on geometric interpretation of music theory replacing traditional modern music notation with geometric shapes including chords represented by polygons that are colored with colors or hues.