Repertoire is a French word meaning a group or collection of pieces that an artist can perform; for example, a group of songs that a busker knows and can perform for an audience is her repertoire.
The Macquarie Dictionary (1982 edition) defines the word as:
1. The list of dramas, operas, parts, pieces, etc., which a company, actor, singer or the like, is prepared to perform. 2. All the works of a particular kind considered collectively. [F, from L(atin) repertorium inventory, catalogue]