Actually, yes. I used to be a musician although that feels like it was in another life now. I grew up singing in bands, and later became an amateur singer/songwriter. I haven't picked up my guitar in years now, except to get some pictures I used for some how-to articles about learning guitar, I still sing whenever there's music on, and sometimes while I'm just working away at something mundane like chopping vegetables or doing the dishes.
Yes, can hold a tune quite well - I'm the only one in my (immediate) family who can (listening to my Mum 'sing' is excruciating! :) ). Though I'd never do anything in public as I don't like being the centre of attention.