There's also...

Stonehenge by Culture Shock
Hymns to the Stone by Acrimony

Hawkwind are a bit of a seam to be mined here too! The lyrics to 'Lord of Light' - "Stones that measure the silvery light"... plus their Atomhenge stage set. Stonehenge Decoded. Not to mention that whole Stonehenge Free Festival thingy.

Kilmartin House produced a CD of supposed Neolithic music too. Hit it with the swan bone flute solo!