Si Hayden is an English musician-composer and long time guitarist of 70's electric violin veteran Joe O'Donnell of East Of Eden, Headstone and Rory Gallagher fame.

[9][10] He has released over 50 albums of largely original material,[1][11][12][13][14] featured on multiple guitar compilations with the likes of Alex De Grassi,[7] Guns N' Roses guitarist Bumblefoot[3] and Will Ackerman.

[11] On the release of his 2011 solo guitar album Supercharger, Guitarist Magazine described him as 'an acoustic virtuoso'.

[15] Hayden has performed and recorded with artists such as John Etheridge,[16] Gilad Atzmon as guitarist in the 'Atzmob', Clive Carroll and Soweto Kinch.

[17] Other groups have included The Morley Hayden Haines trio who performed at The Guinness Cork Jazz Festival in 2009[1][18] and BBC1 television appearances with Rob Halligan.