The present disclosure is directed at systems, methods, and apparatus for implementing a rhythm-action game having an improvisational fill feature. The rhythm-action game can provide a musical track having at least one section that can be varied. The rhythm-action game can also provide a database having a plurality of fills, wherein each fill includes a soundtrack and a set of cues. During run-time, the rhythm-action game can select, for each section in the musical track that can be varied, a fill from the plurality of fills. In some embodiments, this selection can be based on various characterizing parameters to ensure that the fill is a good fit for the musical track. The rhythm-action game can also display a set of visual cues associated with the selected fill, and to evaluate whether received user input substantially corresponds to the displayed cues.

Arranged accompaniment data are created by: acquiring original performance information; extracting, from the acquired original performance information, one or more accent positions in a music piece represented by the acquired original performance information; acquiring existing accompaniment pattern data; and adjusting time positions of one or more accompaniment notes, which are to be generated on the basis of the acquired accompaniment pattern data, so as to coincide with the extracted one or more accent positions. In this way, it is possible to create accompaniment data matching accent positions (rhythmic elements) of the music piece represented by the original performance information and thereby automatically make a musical arrangement with respective characteristics of the existing accompaniment pattern data and original performance information remaining therein.

A method and system for analyzing patterns in the relationships of notes of an input piece of music. The method comprises generating a set of the most frequently occurring note pitches in ascending pitch order that matches an interval pattern, and detecting out-of-key pitches that lie outside of this interval pattern. One or more potential key sequence bifurcations are identified which represent a list of possible key sequences according to forwards and backwards analysis. By finding patterns of repetition in the chordal sequences that may be generated according to these key sequence bifurcations, a key sequence that allows the most frequently recurring chord sequences may be chosen. Chord sequences may be analyzed by using ghost chords, temporary harmonic structures that are created, updated and finalized over time according to a combination of essential and inessential note fragments. The method further comprises identifying non-harmony pitches according to the analyzed chord sequence.

A mobility sound generation apparatus of generating a sound suitable for a landscape while driving of a mobility may include an information acquisition device provided in a mobility to acquire information on an outside landscape of the mobility while driving of the mobility; a sound generation device configured to generate a sound corresponding to the information on the outside landscape; and a sound output device configured to output the generated sound, whereby it is possible to acquire information on an outside landscape while driving of the mobility and generate a sound corresponding to the information on the outside landscape and it is possible for facilitating an occupant to admire a landscape by expressing the outside landscape with sound while driving to generate and provide the sound corresponding to water, mountains, buildings or the like forming the outside landscape of the mobility.