Thanx for your help!
I think I'm going to create a new field called "artist (list)". It's easy in MC to copy the field "artist" to the new field and they are already delimited by a semicolon.
[until the release of MC 11 in february I hope that there will be the possibility in the options-tree&view-columns to have more control over the columns. you are right, darichman!: also other fields should be handled as a list. Sometimes a song belongs to more than one genre. An older wish of mine was to define where a column is stored in the tag: User defined frame, multiple comment frame ore predefined frame (f.e. for label "Tpub"-frame) (label is stored in the comment frame, but i have already tagged mp3s with the frame "Tpub" and it is much work to copy the value to the commentfield). my idea is to put under the "store in tag if possible" checkbox an option between this three possibilitys.]
By the way: i don't know MC for a long time and i love it