Is YouTube Music mainly for casual listeners or serious listeners?

It can suit both. The better dividing line is not casual versus serious, but whether your listening habits already overlap with the strengths of the YouTube ecosystem. A serious listener who values rare live versions, remixes, and video-led discovery may get more from it than a nominally serious listener who wants a cleaner album-library experience.

The reason this misconception survives is that YouTube Music does have a clear centre of gravity. Its strongest case is still people whose music habits already overlap heavily with YouTube and who often look for hard-to-find versions rather than just the standard album release, which is why people reduce it to a narrower stereotype than it really deserves.

That is why YouTube Music resists the usual stereotype. It is not shallow by default; it is simply built around a different idea of what a useful music catalogue looks like. The real test is whether the service still holds up once you move beyond its most obvious audience and ask how it fits your own habits.

That makes YouTube Music broader than the stereotype, but not infinitely broad. Its strengths remain the way it connects official catalogue music with the wider YouTube universe of live cuts, alternate versions, and video-first listening, and those strengths still point more naturally toward some users than others.

Source: Official: YouTube Music Help