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78 rpm was chosen as the standard because of the introduction of the electrically powered, synchronous turntable motor in 1925, which ran at 3600 rpm with a 46:1 gear ratio, resulting in a rotation speed of 78.26 rpm.

With these factors applied to the 10-inch format, songwriters and performers increasingly tailored their output to fit the new medium.

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The inherent technical limitations of the gramophone disc defined the standard format for commercial recordings in the early 20th century.

The relatively crude disc-cutting techniques of the time and the thickness of the needles used on record players limited the number of grooves per inch that could be inscribed on the disc surface, and a high rotation speed was necessary to achieve acceptable recording and playback fidelity.

In most cases, a single is a song that is released separately from an album, although it usually also appears on an album.

Typically, these are the songs from albums that are released separately for promotional uses such as digital download or commercial radio airplay and are expected to be the most popular.

Although CBS tried to make the record more "radio friendly" by cutting the performance into halves, and separating them between the two sides of the vinyl disc, both Dylan and his fans demanded that the full six-minute take be placed on one side, and that radio stations play the song in its entirety.

Singles have been issued in various formats, including 7-inch (18 cm), 10-inch (25 cm), and 12-inch (30 cm) vinyl discs (usually playing at 45 rpm); 10-inch (25-cm) shellac discs (playing at 78 rpm); cassette, 8 and 12 cm (3- and 5-inch) CD singles and 7-inch (18 cm) plastic flexi discs.

The 7-inch 45 rpm record was released 31 March 1949 by RCA Victor as a smaller, more durable and higher-fidelity replacement for the 78 rpm shellac discs.

The first 45 rpm records were monaural, with recordings on both sides of the disc.

It’s the same aluminum unibody, 5.5-inch LCD 1080p display, and overall feel.

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