Bob Dylan has taken a swipe at fellow veteran rocker Rod Stewart over his recordings of American standards, insisting they were "disappointing".

The Maggie May hitmaker has released five volumes of re-worked classic tracks since 2002 but Dylan was let down by the project because he felt Stewart's heart was not "into it" enough.

Dylan, who released his own album of classic covers, called Shadows in the Night, last month (Jan15), tells British newspaper The Independent, "I was looking forward to hearing Rod's records of standards. I thought if anybody could bring something different to these songs, Rod certainly could. But the records were disappointing.

"Rod's a great singer, but there's no point putting a 30-piece orchestra behind him. I'm not going to knock anybody's right to make a living, but you can always tell if somebody's heart and soul is into something, and I didn't think Rod was into it in that way."