Different tune

Following concerns over the adult content of Australian Big Brother last year, you could understand the producers being more careful about what goes to air this year. But some caution has come from a different angle: the songs the housemates are singing. I think this comes from concerns that the songs are covered by commercial copyright. This is surmised from a comment made on the show (I think by Gretel Killeen, host extraordinaire) that Big Brother was being prevented from airing some conversations from the house because there was commercial music being sung in the background. And it seems that at least one house mate has now been penalised for singing in the house. Not getting any easier to be a producer (or housemate) is it?