i think you basically have to approaches that you can adopt...
1. give em some mashups that include queen in them - but also have some other mainstream artists in the mash...or
2. include a quick 10-minute queen megamix
that way...those who dislike em will get a "greatest hits" snippet - which will work easier
some mashups to look for:-
the "magic mashup" which includes queen "a kind of magic/pilot - magic, olivia newton john "magic" steve miller abracaddabra" etc and segue it into "queen vs madonna - a ray of magic" which can segue into....queen vs madonna - crazy littrle beautiful stranger...you could segue this into the beatles vs queen crazy litlle fool on the hill
ok...so that's just my ideas...see how you get on...
if you need any files mentioned above...or the queen magamix...just email firstname.lastname@example.org - remember to say who you are
go deo na hÉireann