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When James mentioned the phrase Killer Queen written with flourishes under Evans's name in her Charms book, Sirius guessed it referred to some more exciting Muggle music than what they'd heard before.
A couple of years later he was trying his best to focus on the band while he wanted to strangle Peter only for pushing between him and his Moony in the crowd, and when peeking around to feast his eyes on the face he was dying to touch, he saw tears of anger run down the cheeks, as Moony was singing along about having been had and been made to castrate his human pride.
Finally, on that very last night before he learnt who the traitor was, he used the fresh single to fill the silence in the flat he doubted the two of them could bear sharing much longer under all the pressure, and they ended up dancing in a tight embrace so as to give love one more chance.