Much of the credit for the development of multitrack recording goes to guitarist, composer and technician Les Paul, who lent his name to Gibson's first solid-body electric guitar. His experiments with tapes and recorders in the early 1950s led him to order the first custom-built eight-track recorder from Ampex, and his pioneering recordings with his then wife, singer Mary Ford. But it was Patti Page who was the first vocalist to record her own voice, sound on sound, with a song called 'Confess', in 1947: Bill Putnam, an engineer for Mercury Records, was able to overdub Page's voice, due to his well-known use of technology. Thus, Page became the first pop artist to overdub her vocals on a song. This was months before Les Paul and Mary Ford had their first multi-voiced release. Paul was the first to make use of the technique of multitracking to record separate elements of a musical piece asynchronously – that is, separate elements could be recorded at different times. Paul's technique enabled him to listen to the tracks he had already taped and record new parts in time alongside them. In 1963, solo jazz pianist, Bill Evans, recorded Conversations with Myself, an innovative solo album using the unconventional (in jazz solo recordings) technique of overdubbing over himself, in effect creating a two-piano duet of jazz improvisations.