holy cow, marko, you are the best with this stuff. i thought that that what i wanted was impossible. so i asked the question a bit simpler concentrating on the bottle neck. what i wanted was a view with my artiesten (artists, a list field), maybe only showing the 7 artiesten with the most songs. and underneath it, in the files a random list of their songs. i need to work a bit on it. but i get where i want. here is a view with the top artists with there amount of songs under it.
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so, thanks a lot!!
edit: got it the way i wanted it. or at least good enough.