It only depends on the artist releasing the music for download or using external websites. Not only that, but it can be said that the whole process of downloading music online over there is very simple and fast.
Fortunately, it's very easy to download music from SoundCloud, even if you want to do it directly on your Android smartphone. In fact, it is one of the oldest services of its kind and one of the few that still offers ways to download free music. SoundCloud is one of the music streaming apps that needs no introduction.