Sing's beatmapset of "nanobii - popsicle beach"
A beatmapset is a set of beatmaps for the same song. The beatmap listing shows all of the beatmapsets submitted online.
When multiple people contribute to a single mapset, the uploader is known as the host, and the rest are called "guests". Guests usually help by creating guest difficulties.
Beatmapsets are sometimes referred to as "beatmaps", but on this wiki "beatmap" usually means a single difficulty.