Most people don't know that when Pink Floyd recorded their classic album 'Wish You Were Here', they incorporated Stephane Grapelli's jazz violin in the title song. However, in the final mix it wasn't audible, so he wasn't credited.
Many years later, when the album was remastered, Grapelli's playing was highlighted once more. Here's the restored version of the title song.
Progressive rock meets classic jazz. Wonderful!