The EP, extended play album, is the size of a 45, usually with 2 or 3 songs on each side. Many can be quite valuable, especially by the Doo Wop groups of the 50’s. The Platters’ EP, “The Platters Sing for Only You,” released by Federal Records in 1956, and the Flamingos’ EP, “Goodnight Sweetheart,” released by End Records in 1959, can each get you $600.00 today.