His music is characterized by unusual chord progressions, influenced by his background in jazz harmony, and uncommon selections of instruments for small orchestras. Most of Bacharach's and David's hits were written specifically for and performed by Dionne Warwick, but earlier associations (from 1957 to 1963) saw the composing duo work with Marty Robbins, Perry Como, Gene McDaniels, and Jerry Butler. Following the initial success of these collaborations, Bacharach went on to write hits for Gene Pitney, Cilla Black, Dusty Springfield, Jackie DeShannon, Bobbie Gentry, Tom Jones, Herb Alpert, B. J. Thomas, the Carpenters, among numerous other artists. He arranged, conducted, and produced much of his recorded output.