This impressive series features intermediate-level arrangements for instrumentalists with piano accompaniments, in a range flattering to the specific instrument. The books include access to online audio recordings of piano accompaniments for each piece. The music has been edited with added dynamics, articulations, and phrasing suggestions, making it appropriate for lessons or performances. The accompaniments have been recorded on an acoustic grand piano and are accessed online using the unique code inside each book. They can be streamed or downloaded. The audio files include PLAYBACK+, a multi-functional audio player that allows you to slow down audio without changing pitch, set loop points, change keys, and pan left or right.