It's certainly not huge but I don't think it's tiny either. There's a growing market of people who care deeply about audio quality. Perhaps not to 'proper audio

It's certainly not huge but I don't think it's tiny either. There's a growing market of people who care deeply about audio quality. Perhaps not to 'proper audiophile' level but enough to choose a phone largely on music. Would explain why HTC, LG and several Chinese brands are specifically targeting that area.