You do realise most of the examples given in this thread are not all that unusual. I mean, fair enough, if you only like one clearly defined style and want all the bands on a bill to sound identical to the band you paid to see, then of course you will be dissappointed if one of the acts varies ever-so-slightly in style. However, if you are a reasonably open-minded music listener then you should be able to accept that a band you go to see may be supported by a band who are of a different musical "style", but the same "genre" if you will. (As long as its not, for example, Dido playing second from the top at the V Festival this year).