I want to download music but that shows the song title, album title, the group who made the song, and the original album cover (censored if not available). I want to download popular bands and underrated bands, too (Noise Pollution (punk rock), Paracoccidioidomicosisproctitissarcomucosis, Agoraphobic Nosebleed, etc.) without spending any money.
You have not said anything that leads to an answer. Anybody with a computer can download free music. It is harder to find it than to download it. Maybe you mean an app to find the music you want. An app is not required, but if you use one it depends on what equipment you have. So you are not telling us what you want.
I used a mix of tools to help me get free music. Of course, there are different music apps. But they don't contain all the songs I want. So I turn to online services (which you can easily google online) sometimes to get music offline, and desktop software like Winx video converter, 4K video downloader, and some others.