Credits:
- Written by David Foster & Linda Thompson
- Italian Translation by Alberto Testa & Tony Renis
- Produced & Arranged by David Foster
- Orchestra Arranged & Conducted by William Ross
- Engineered by David Retinas & Felipe Elgueta
- Mixed by Mick Guzauski
Josh Groban appeared on Paul O'Grady's British talk show in 2007 and talked about working with Streisand on “All I Know of Love.” Groban said, “I was so nervous because at the time I did the duet with her ... I was 21 years old. You just try to soak it up like a sponge ... She was so nice, she didn't have to do the song with me and she did. It was wonderful ... We got to sit and talk and go over the mix together and really sing a lot together. She's been a friend ever since,” Groban explained. (They recorded together again on Barbra's 2014 album, Partners.)
As for Streisand's working method, Groban said, “She's a perfectionist. Her phrasing is so impeccable. She'll go over a line a hundred times just to make sure it's the right way. She rehearses everything so much, and that's why she's always so perfect.”
Streisand told radio host Delilah (during an interview in 2002) about her experience working with Josh Groban. “I recorded it a while ago before he got famous,” Barbra said. “He was a substitution for Andrea Bocelli. In other words, Linda and my friend David Foster, had written a song for me and Bocelli. So [Josh Groban] did the part that Bocelli was supposed to sing. [Foster] played two different voices for me—a different kid who was Italian—and I picked Josh, and we did the duet together.”
There was a bit of record label legal-stuff involved with Groban's duet — he was signed on the Warner Brothers label.
BJS Music reported: “Warner Bros. has prohibited Columbia from using Josh Groban's name in its advertising, promotion, and publicity for
Duets . His name will appear on the CD, of course, but don't expect to see it anywhere else unless the situation changes.” The duet with Streisand never appeared on any of Josh Groban's albums.