Los Angeles quartet Ambrosia, whose founding members included guitarist/vocalist David Pack, bassist/vocalist Joe Puerta, keyboardist Christopher North, and drummer Burleigh Drummond, fused symphonic art rock with a slickly produced pop sound. The group was discovered in 1971 by Los Angeles Philharmonic conductor Zubin Mehta, who featured Ambrosia as part of a so-called All-American Dream Concert. However, it took them four more years to get a record contract; Ambrosia was released in 1975 and spawned the chart singles "Holdin' on to Yesterday" and "Nice, Nice, Very Nice." (The latter was based on Kurt Vonnegut's Cat's Cradle.) Ambrosia scored another hit in 1977 with a cover of the Beatles' "Magical Mystery Tour" from the film All This and World War II, which they also appeared in.