Jukebox EP
In the 1960s and 1970s, record companies released EP versions of long play (LP) albums for use in jukeboxes. These were commonly known as "compact 33s" or "little LPs." They played at 33⅓ rpm, were pressed on 7-inch vinyl and frequently had as many as six songs. What made them EP-like was the fact that some songs were omitted for time purposes, and the tracks deemed the most popular were left on. Unlike most EPs before them, and most 7-inch vinyl in general (pre-1970s), these were issued in stereo.
Read more about this topic: Extended Play