First recorded by Yvonne Elliman (US #28/UK #47 1970).
Other hit version by Helen Reddy (US #13/CAN #8/AUS #2 1971).
From the wiki: “‘I Don’t Know How to Love Him’ was written by Andrew Lloyd Webber and Tim Rice song for the 1970 Rock opera Jesus Christ Superstar. The song has been much recorded with it becoming one of only a handful of songs to have two concurrent recordings simultaneously reach the Top 40 of the Billboard Hot 100 chart. ‘I Don’t Know How to Love Him’ had first been published with different lyrics in the autumn of 1967, originally titled ‘Kansas Morning’. (The melody’s main theme has come under some scrutiny for being non-original, bearing a resemblance to a theme from Mendelssohn’s ‘Violin Concerto in E Minor’.) Rice wrote new lyrics to ‘Kansas Morning’ when Lloyd Webber and he completed Jesus Christ Superstar in January 1970. Now, entitled ‘I Don’t Know How to Love Him’, the completed song was recorded at a June 1970 Decca Records recording session by Yvonne Elliman in one take.
“The choice for a single release from the album (on Decca in the UK; on MCA in the US) went to the title track, ‘Jesus Christ Superstar’, sung Murray Head. Meanwhile, Capitol Records executive Artie Mogull had heard the potential for a smash hit in ‘I Don’t Know’ and first pitched the song to Linda Ronstadt, then on the Capitol roster. After being advised by Ronstadt that she hated the song, Mogull invited the then-unknown Helen Reddy to record the song as part of a one-off-single deal with Capitol, intending the song to serve as B-side for the song Reddy wished to record – a Mac Davis composition, ‘I Believe in Music’. When Reddy’s cover began moving up the charts in the spring of 1971, the original recording by Elliman was also issued as a single. Elliman’s version reached #28 on the Billboard Hot 100; Reddy’s version was more successful, peaking at #13.
Helen Reddy, “I Don’t Know How to Love Him” (1970):