As close to her ear as it is and as loud as a backstage area is I highly doubt anyone else could hear it... and it's also possible that it was a voicemail and not music... she was having her hair/makeup done... she was actually being courteous by putting it on speaker and holding the very end up to her ear instead of holding the phone the way you usually would... also earphones get in the way - if you've never had an earbud ripped out of your ear by someone with a brush/comb in a hurry to do your hair, trust me, it's unpleasant - and the hair person doesn't appreciate it either...