Jimi Hendrix's unreleased recordings offer a ''fantastic window'' into his mind.

A new album of unreleased material by the legendary guitarist, 'People, Hell and Angels', has been compiled by Eddie Kramer - who worked closely with Jimi on his 'Electric Ladyland' album and as an engineer at his Electric Lady studios - and he says it gives an interesting insight into his musical skills.

He said: ''It's a fantastic window into Jimi's mind, putting together bands that were different from [regular backing band] The Experience. In 68 and 69, Jimi was in the studio constantly.

''His whole life was in the studio - there virtually wasn't a moment where he wasn't in the studio.''

One of the tracks set to be released in the upcoming album is titled 'Somewhere', which Jimi created with collaborator Stephen Still and drummer Buddy Miles and Eddie thinks this particular track shows Jimi's free approach to making music.

He told Rolling Stone magazine: ''He would come up with these great song ideas and he would be at the Record Planet or the Hit Factory or whatever studio he could get into. During this time he is experimenting and trying all these different musicians - stretching out the boundaries.

''It yields some fantastic songs, which are included in this album. It's him, Stephen Stills on bass and Buddy Miles on drums. He hadn't worked with them before but here he is establishing his independence by doing this track.''

'People, Hell and Angels' is to be released in March 2013.

Jimi passed away in London in 1970 in his sleep after an overdose of sleeping pills.