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Welcome! This guide will explain what a "45" is, why it is important, and how to find them in the Library catalog.
A "45" is a small vinyl record - usually 7 inches in diameter. It typically contains one song on each side - one on the front ("A side") and one on the back ("B side"), which are about 7 minutes long. There are also 12-inch 45s, which were mainly produced in the 1970s and 1980s.
They are called "45s" because they are played on a record player (turntable) at 45 rpm (rotations per minute).