Up until the early 1950s, records were marketed primarily to adults who could afford phonographs. Pre-teens and teens had radios and jukeboxes, but much of the music they heard reflected adult tastes. The turning point came in 1949, when RCA introduced the 45—a virtually unbreakable vinyl disc with a large hole in the center. At first, RCA used the 45 to compete against Columbia’s 33 1/3 album, which had been unveiled a year earlier. To take on its rival, RCA sold multiple 45s for each album and manufactured a special phonograph that could drop a stack of 45s individually onto the turntable, each one playing in turn. But by 1951, RCA realized that its efforts on behalf of the 45 were impractical compared with the ease of Columbia’s LP, a format that quickly became the industry’s preferred standard for albums. But the 45 had a bright future. In 1952, the jukebox industry announced it would begin replacing the heavy 78 with the lighter and more durable 45. Since most R&B recordings were heard on jukeboxes, that genre soon rolled over onto the 45.