Extension is the third album by composer/arranger/keyboardist Clare Fischer, and his first for big band, recorded and released in 1963 on the Pacific Jazz label, reissued on CD (together with the 1967 LP, Songs for Rainy Day Lovers) in 2002 as America the Beautiful, and, under its original name, in 2012.
According to Ed Beach, disk jockey of the WRVR 106.7 FM New York radio program “Just Jazz,” on this album, all of the solos, except for those of Clare Fischer and tenor saxophonist Jerry Coker, were written out (by Fischer), not improvised.