Reflecting their musical diversity and the then-common term ‘pop music’, for the first few years, particularly in the US, many rock festivals were called ‘pop festivals’. This also served to distinguish them among the ticket-buying public from other, pre-existing types of music festivals such as jazz and folk festivals. By the end of 1972, the term ‘pop festival’ had virtually disappeared as festival promoters adopted more creative, unique and location-specific names to identify and advertise their events. While it was still in vogue, however, over-zealous promoters eager to capitalize on the festival concept made the most of it, with some using the term "Pop Festival" or "Rock Festival" to advertise events held on a single day or evening, often indoors, and featuring only a handful of acts.