Proof of the suspicions appeared later: in 2012, a Library of Congress archivist revealed that material donated by Wayne's wife the previous year included an unreleased recording of the guitarist playing the tune at a jam session in 1946. Then, it was known by the title "Sonny", after trumpeter Sonny Berman, who also played at the session.
In 2012, evidence supporting suspicions about the musician's involvement with the tune surfaced: a Library of Congress archivist revealed that material donated by Wayne's wife the previous year included an unreleased recording of the guitarist playing the tune at a jam session in 1946. The recording was later identified as "Sonny", after trumpeter Sonny Berman, who also participated in the session.