After earlier opening for the Grateful Dead with the Range, Bruce makes the first of over one hundred appearances with the Grateful Dead, sitting in on accordion for Sugaree and Memphis Blues in Hebron, OH.
He later became a long-standing full-time member on keyboard and piano.
You can hear that performance at Archive.org.
Here’s Bob Weir talking about working with Bruce, filmed for the “Bruce Hornsby and Friends” DVD release in 1995.