Howard,
Regarding Nick Drake, his first two albums Five Leaves Left and Bryter Layter were recorded with a band containing guys like Richard Thompson (Fairport Convention) on electric guitar and Danny Thompson (Pentangle) on acoustic bass. If you like sensitive singer-songwriter stuff from the early 70's these albums are above average and contain some real gems like Hazey Jane. A lot of his stuff has been lifted for TV work and I'd be surprised if you haven't heard the instumental passages from at least half-a-dozen songs from these two albums.
Pink Moon was recorded with just ND on acoustic guitar and occasionally piano and is very, very bleak. There is an album released posthumously Black Dog but it's for completists only.
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Steve Hackett - there's a guy who never courted popularity. His work is quite dense and not always an easy listen. His most accesible work is Spectral Mornings but an album I think you'd like is Genesis Revisited (released in '97) which is old Genesis tracks, not all from the SH era, revemped. He has released a lot of live material over the last few years, both recent and archive, always interesting never a guy to rest on his laurels.
I always consider SH to be the most important member of the group musically as it was he who persuaded the group to invest in a Mellotron, prior to the Nursery Cryme album, which defined Genesis's sound up till And Then There Were Three and the Phil Collins era.