Peter Erskine launches apps to play along with his jazz album Joy Luck

"The application distinguishes itself from other minus-one offerings by providing isolated stems for individual instruments. Karaoke, for example, is a popular music-minus-one offering limited in that only the voice is replaced. Likewise, Guitar Hero simply removes the guitar track. Additionally, both of these platforms remove the technicality from playing music. With Erskine’s app, practicing musicians can substitute Erskine’s studio recorded bass, drums or keyboard for their own live instruments using the original sheet music for guidance." - DailyTrojan.com