Valentino said
Triangle was partially inspired by several day trips he took to the
California Palace of the Legion of Honor, a
fine art museum in
San Francisco. He admired the collection of 17th century Flemish portraits and landscape paintings at the museum, from which dark yet incandescent hues emanated. and dream-like characters, such as the gypsy in "Only Dreaming Now", the "Painter of Women", "The Keeper of Time", and "The Wolf of Velvet Fortune", as well as the destination of "
Magic Hollow". Having regained artistic freedom in the studio, and with the band no longer touring, Elliott and Valentino focused on creating an album of songs which were written and recorded specifically for that purpose. The resulting sessions for
Triangle saw Elliott and Valentino collaborate as songwriters for the first time. Four of the album's tracks were written by Elliott with frequent collaborator Bob Durand. The album also contained the
Randy Newman composition "Old Kentucky Home" and a
cover version of
Merle Travis's "Nine Pound Hammer", both of which hinted at the
country rock direction explored more heavily by the band on their 1968 album, ''
Bradley's Barn''. Session musicians included guitarist
James Burton, drummer
Jim Gordon, bassist
Carol Kaye, and
Van Dyke Parks, who played
harpsichord on "Magic Hollow", adding to the album's
psychedelic musical style. {{cite web Elliott returned the favor, playing guitar on Parks' 1968 debut album,
Song Cycle.
Triangle also features strings, brass, accordion, woodwinds, and numerous types of percussion. ==Release and reception==