One genre that is heavy with "1-hit wonders" is the Garage Band music of the 1960’s. After The British Invasion took over the music business in 1964, every town and city in America witnessed an explosion of local bands who were inspired by The Beatles, Stones, Kinks, Animals, Yardbirds, Who, etc. In my home town of San Jose, California, we had The Syndicate Of Sound ("Hey Little Girl"), People ("I Love You", a cover of The Zombies song), The Count Five ("Psychotic Reaction", an obvious, blatant, shameless imitation of The Yardbirds’ "I’m A Man", itself a pale, whitebread cover of the Muddy Waters original), The Chocolate Watchband (no hits, but three albums on Tower Records, and an appearance in the Roger Corman teensploitation movie Riot On Sunset Strip. I was in attendance at their first live gig. The Watchband’s drummer was a couple years ahead of me at Cupertino High.), and Stained Glass (no hits, but two albums on Capitol Records. Bassist/singer Jim McPherson left the group to join Copperhead, the band started by Quicksilver Messenger Service guitarist John Cipollina. John’s brother Mario was later the bassist in Huey Lewis & The News.).
Anyway, Rock ’n’ Roll historian, critic, publisher (Bomp magazine), record company owner (Bomp Records), and Garage Band fanatic/collector Greg Shaw was (R.I.P.) about as hardcore a 45 collector as I am aware of. At the time of his death in 2004, his collection of 7" 45 RPM singles devoted to regional Garage Band releases numbered 100,000! That’s a lotta shoe boxes ;-) . By the way: when Greg was managing The Flamin’ Groovies, their fan club president was Mirian Linna, later the first drummer of The Cramps. I still have my Flamin’ Groovies Fan Club badge, handmade by Miriam. She quit The Cramps to join the NYC Rockabilly band The A-Bones, and has a coupla solo albums. Very cool chick.