Country legend Willie Nelson has pulled out of plans to honour Stevie Wonder at a Grammy Awards tribute show next month (Feb15) as Lady GaGa and Ariana Grande have been added to the line-up.

No further details about Nelson's decision to step down have been revealed, with Recording Academy bosses simply stating he is no longer performing.

The news emerges as pop stars Gaga and Grande, Oscar nominee John Legend and country singers the Band Perry have signed on to join the likes of Usher, Ed Sheeran, Janelle Monae and Chris Martin to celebrate Wonder's career in Los Angeles on 10 February (15).

The two-hour show, titled Stevie Wonder: Songs In The Key Of Life - An All-Star Grammy Salute, will be broadcast on U.S. Tv on 16 February (15).