Acronym Soup: LDTO?

Questions

Music : The Who's rock musical stars Elton John. It's called ________.?

Music : This female artist enjoyed sucess on both popular and country & western stations with such tunes as "Let Me Be There" and "Have You Never Been Mellow."?

Music : This was the Beatle's first film.?

Music : What Procol Harem tune was based on the Bach cantata Sleepers Awake?

Music : What band recorded the 1978 hit album: "Briefcase Full of Blues"?