ohh, not absolutely solved, sorry.
With the code above I get the list of all sub custom field values “artistname”, but not 100% correct. They are still sorted by posts (query-type “events”) somehow.
If events have only one row it works fine
Event 1 – artist – Abba
Event 2 – artist – Duran Duran
Event 3 – artist – Foo Fighters
But if an events has more then one row, not the row itselves is posted alphabeticaly.
Event 4 – artist – Coldplay, Aerosmith, Eminem
The list looks like this:
It should look lite that, 100% alphabeticaly:
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