Why Vinyl Records Spin at Two Different Speeds

In 1948, Columbia Records did something quietly radical: it slowed a record down. The new format spun at 33⅓ revolutions per minute instead of the industry-standard 78, was pressed into vinyl instead of brittle shellac, and could hold about 20 minutes of music per side instead of four. Columbia called it the LP, for long play, and offered to license it to every other label in the business, including its biggest rival, RCA Victor.

RCA said no. Within a year it released its own format instead: a 7-inch disc spinning at 45 rpm, small enough to fit in a jacket pocket and cheap enough to sell for less than a dollar. Two of the biggest labels in America had just released two incompatible record formats within twelve months of each other, and neither had any intention of backing down.

What Was the 'War of the Speeds'?

Record collectors still call the scramble that followed the War of the Speeds. Until roughly 1950, a shopper walking into a record store had to pick a side: a 33⅓ rpm player for Columbia's new long-playing albums, a 45 rpm player for RCA's singles, or a 78 rpm player for the format everyone already owned. Some machines could only handle one speed. Classical listeners, who had spent decades enduring mid-symphony pauses to flip a 78, cared the most — the LP finally let a whole movement play without a break, something a 45 still could not do.

RCA tried to make its format impossible to ignore. Records came pressed in eight different colors of vinyl sorted by genre: black for pop releases, green for country, yellow for children's records, red for classical, orange for R&B and gospel. It was a clever way to make a 45 identifiable across a store from ten feet away. It also cost more to produce than plain black vinyl, and the color-coding quietly disappeared within a few years, surviving today mostly as a novelty for special-edition reissues.

The 45 kept evolving after the speed war ended. In 1952, RCA stretched the format into the Extended Play record, narrowing the grooves to squeeze up to 7½ minutes per side and three to six songs onto what was still, physically, a single. The first stereo 45 arrived in June 1958, pressed by BelCanto Records, a full decade after the format's mono debut. None of it touched the underlying speed. Whatever RCA added to the format, the 45 rpm groove itself never changed.

Why Did 33 and 45 RPM Both Survive?

Neither format won outright, because neither was actually competing for the same job. A 33⅓ rpm groove is packed tighter, which trades a little audio fidelity for roughly 20 to 30 minutes of music per side, exactly what a full album needs. A 45 spins faster, tracing more groove per second, which trades playing time for louder, cleaner sound, exactly what a single blasting from a jukebox needs. By 1950 the market had sorted itself out without either label admitting defeat: albums went to 33⅓, singles went to 45, and the 78 rpm speed was extinct in mainstream new release by the mid-1950s.

How Long Can One Side of a 45 Actually Play?

Longer than most listeners assume, but not by much. When John Lennon asked producer George Martin in 1968 whether a 45 could hold a song longer than the usual two to three minutes, Martin ran the numbers on standard groove width and found the ceiling: 7 minutes, 11 seconds, before sound quality collapsed or the groove risked tripping an automatic record changer. That became the released length of "Hey Jude," still one of the longest songs to ever top a singles chart pressed at 45 rpm.

The 45 stayed dominant for four decades, cheap enough to trade with friends and small enough to stack a dozen at a time on a spindle changer. It did not lose to a better-sounding format; it lost to convenience, first to the cassette single in the late 1980s, then to the CD single, then to downloads. What stands out in 2026 is that both formats are still being pressed new, decades after the War of the Speeds was supposed to have a winner, a reversal that has shown up directly in the sales numbers, with CD sales now growing faster than vinyl's for the first time in years. The groove width Columbia and RCA argued over in 1948 is still, unglamorously, the reason a record collection needs two different turntable settings.