Even in the current age, a CD may be referred to as EP (extended play) if it has a few too many tracks to be a single, but not enough tracks to be an LP. EP's are typically released by independent bands because they don't have enough money to record a whole album's worth of material. An EP might have 5 or 6 tracks on it, and a total of 20 minutes of music on it. Appearance-wise, it looks like a normal CD.