Popular music streaming services (Apple Music, Deezer...) claim they have more than 90mln songs available.
Let's say you need to store 180mln songs, doubling Apple Music's library.
Let's say a full song takes 10MB.
10MB * 180M = 1800MMB = 1.8PB ?
If you store them in HDDs of 16TB (Seagate sells them at €200), you need
113 HDDs, so at least €22.600 worth of HDDs.
But you need at least a RAID 1 setup, so 226 HDDs
You can store the entire music library ever produced inside a shed