sentences:  Walder released notable side projects and duets, trios, and quartets, with musicians such as Will Ackerman, Suzanne Ciani, Michael Gettel, Balafon Marimba Ensemble, Andrew White, New Zealand Symphony Orchestra, and many others.He has contributed as a composer and performer to many compilations, including "The Windham Hill Sampler 1986", "Comfort Music", "Meditation", "Windham Hill