This is an amazing site to listen to music with random people, make your own playlists, and even listen with friends! Some videos that are freely played by the users may not be child friendly. Watch where you roam.
Generally kid-safe, but there's no filter against music with explicit lyrics or videos (however, these happen rarely in practice). Also, like anywhere on the internet that has a forum or chat room, people speak pretty freely. In short, it's usually a family-friendly place to enjoy sharing music, but parents will want to supervise kids or orient them to the fact that they may encounter occasional coarse language.