The band was originally promoted by Chris Curtis under the name "Roundabout". During a brief tour of Denmark and Sweden in April 1966, in which they were still billed as Roundabout, Ritchie Blackmore suggested a new name: "Deep Purple", named after his grandmother's favourite song. The group had resolved to choose a name after everyone had posted one on a board in rehearsal. Second to Deep Purple was "Concrete God", which the band thought was too harsh to take on.
"Deep Purple" was the biggest hit written by pianist Peter DeRose in 1933 as a piano composition. With time it became very popular in sheet music sales and in 1938 Mitchel Paris added the lyrics: Since then, many versions were released reaching top positions.
Grannie's favorite was the one by Bing Crosby but the one which hit number one on the U.S. pop charts (the 100th song to do so) in November 1963 and also won that year's Grammy Award for Best Rock and Roll Record, was recorded by Nino Tempo & April Stevens (who are brother and sister). It remained in the Top 40 for twelve weeks and was #1 on the Hot 100 in November 1963 the week before John F. Kennedy was assassinated.