Jazz Combo - Level 3 - Digital Download SKU: A0.1261317 By Eric O'Reilly. By Eric O'Reilly. Blues,Funk,Jazz,New Age,Standards. 22 pages. Eric O'Reilly #854390. Published by Eric O'Reilly (A0.1261317). Flux is a new and exciting song written and performed by Eric O'Reilly. It's got unique chords, a fast paced funky rhythm and drum beat, and a fun modal solo section. It's best performed with a small jazz ensemble. Written for the instruments: Piano, Guitar, Bass, and Drums. Can be played with more or less instruments than listed.