Now what would be interesting regarding those friends who say "all sounds the same to me" and can't carry songs; can they hear when harmony/melody/some instruments played out of key?
I am assuming they should notice that pretty quickly, so a lot of it comes down to level of critical interest, a friend of mine comes from a very musical family (two brothers trained in piano/saxophone and his parents also have a background with music-singing) and he is happy listening to music through his laptop using connected mini speakers and just shrugs regarding subjective qualitative/satisfaction differences.
Probably like your friends he is not critical of my own purchasing commitment to audio, but is indifferent to it.
Cheers
Orb
Oh a couple of the boys LOVE to sing! They just can't! LOL. It's all good fun since they DO make up for it with stage presence LOL. Anyway it is an awfully small sample size. I'm inclined to think that they may indeed not be able to detect something flat or sharp. In Karaoke theres a melody to follow. Either they can't hear how off they are or they aren't really listening, maybe both.