Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.

Sentence: 'Soul queen Aretha Franklin has joined Madonna and Alanis Morissette in forcing fans to break a sweat at her concerts - because of her gripping fear of air conditioning .', Argument/Subject 1: 'aretha franklin', Argument/Subject 2: 'soul'
be queen of