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[ That... draws out a deep blush from her; it's a complete lie. She doesn't think she's the worst singer on the planet, and she isn't tone deaf - but "lovely?" That's not the first word that comes to mind when she thinks of her singing. ]
Thank... you. Sorry...
[ She doesn't catch on quite yet what she's doing to him by listening together - and of course it would be to the song "Hot One" - but she feels bad for having distracted him. So - much to his chagrin, I'm sure - by complimenting her he pretty much sealed that she wouldn't be singing anymore. ]