Does it sound familiar?

"45"
Sell "45"
The school set loves 'em, now that you can get those Bluebird hits on "45." and--from coast to coast-- teenagers are lining up for bargain player attachments. The whole thing's on key with their allowances--neat little records they can slip in their pockets, with a first-class band playing their favorite hit--for 49 cents Times are like the 30's, the early 40's again, when the youngsters made up the big biz in the pop market. They go for Flanagan, they go for the lowest priced at the new speed, they go for the little disc that fits on the shelf beside their paper-backed novels, is unbreakable, and has quality of tone that can't be matched. Sell 'em, sell 'em "45"

http://www.history-of-rock.com/fortyfive_birth.htm