“Happy Jack” was written by Pete Townshend and was a part of their early stage act for a number of years. John Entwistle shared the lead vocal with Roger Daltry making it a vary rare Townshend song that was not sung solo by Daltry.
It was a huge hit in their native England peaking at number three. Released during early 1967, it became their first top 30 hit in the United States peaking at number 24 on the BILLBOARD MAGAZINE Hot 100.
It had a very different sound than much of thier material but is still worth a listen almost 50 years later.