What fun. Yes indeed to "Astral Weeks". Marvellous after all these years - it still thrills me.
Many good albums noted here already ... great debut albums often occur when established musicians form a new group - thus Blind Faith, Led Zep; rather than when they start their career - Bowie's first record showed only teasing glimpses of the superstar to come.
"Music From Big Pink" - The Band. How can we forget this one? Accomplished musicians created a new style and cut a timeless and influential album.
"High Voltage" - AC/DC. A 4-on-the-floor groove as basic as it gets, lifted out of the ordinary by Angus's incedinary solos - fun for Dick and Jane. It wasn't a long way to the top from here for these guys - well, maybe for Bon.
"Inner Mounting Flame" - Mahavishnu. This debut album brought a revolution in sound, and a stream of copy-cats. Maybe not quite as good as "Birds of Fire" to follow, but this record paved the way for rock fans to appreciate jazz fusion.
Regards,