Unfortunately I'm afraid you might be right but true or not its ILLEGAL for any hiring recruiter to base job applicants on person's age, race, religion and gender. Interesting to know the stats on HMV current employees and what the proportion of white, black, Indian etc is and I probably thing its nowhere near to those other retailers.
If you go to places like Wilkinson, Debenhams, Next etc you will immediately notice that they recruit people from all ages and backgrounds but HMV is mainly white and young. I totally disagree HMV is all white as that is nonsense obviously there are ethnic workers but proportion wise probably something like 90% white and 10% others which is still very bad. Interesting nonetheless.
HMV is a rubbish place to work anyway and there are much better and successful retailers should go for instead. HMV was actually in administration last year and luckily brought out. So realistically in future it is unlikely to exist due to poor sales and everyone now buying music, films etc online from Apple, Netflix, Amazon etc