The vibraphonist, composer and bandleader has packed as much as possible into a career spanning everything from funk, R&B and disco to Afrobeat, house music and hip-hop. A founding father of jazz-funk, neo-soul and, indeed, acid-jazz, Ayers is one of the most sampled artists around: “Always sampled but never duplicated,” insisted sideman Robert Pressley, clapping his hands in the air.