Yes, Jack Bruce, but there is no entire album on fretless, but his way playing was a great source of inspiration for me.
He was also a great vina player, an Indian instrument.
His first Warwick Signature model was a terrific bass.
On the double live album Cities of the Heart with Gary Moore, Ginger Baker, Simon Philips, François Garny (another terrific bass player) he is playing a lot of fretless, just like on Sometin Els.