Typically, payment agreements such as this are blanket agreements. Spofiy agrees to give X% of its revenues to the musicians (indirectly) and in exchange it can

Typically, payment agreements such as this are blanket agreements. Spofiy agrees to give X% of its revenues to the musicians (indirectly) and in exchange it can use their music. This is not a fixed fee as it varies with Spotify's revenues. If Spotify can't get any revenue for a year, the musicians won't get paid at all for that year. RIAA is a recording industry association (dealing with mechanical rights) while the article is about paying composers (which is performing rights) so it's not like "RIAA members" valued these tracks to anything. Also RIAA is American where Spotify is not present at the moment.