One hit wonders! There are 2 types – the ones that stand the test of time and the ones that soar to the top of the charts and are forgotten!
Wikipedia describes a ‘one hit wonder’ as –
A one-hit wonder is any entity that achieves mainstream popularity, often for only one piece of work, and becomes known among the general public solely for that momentary success. The term is most commonly used in regard to music performers with only one top-20 hit single that overshadows their other work. Sometimes, artists dubbed “one-hit wonders” in a particular country have had great success in other countries. Music artists with subsequent popular albums and hit listings are typically not considered a one-hit wonder. One-hit wonders usually see their popularity decreasing after their hit listing and most often don’t return to hit listings with other songs or albums.