Discogs lists the definition of "Space Rock" as the following: Space Rock Music | Discogs In my opinion, the early works of Floyd certainly qualify ("Astronomy Domine", "Echoes"), along with Bowie's "Space Oddity" and Ziggy-era work. Certainly Hendrix and the Experience-era records. Something like Spiritualized's Ladies & Gentlemen We Are Floating In Space record would qualify. Then I see it added as a genre to something like Doves' Lost Souls record, which, while lush and spacey, doesn't mention space in the lyrics. Doves - Lost Souls I've lately seen it applied to other questionable bands and songs as well. Has the term "space rock" now lost all objectionable meaning as a genre descriptor?