I think it's a combination of conditioning, musical feeling and also taste. For some people a trance song can be very emotional, and for others it's just cheezy.. Also our perception of emotional, cheerfull... is different then from people from let's say the 18th century, what's emotional music for them mostly sound cheerfull to my ears (i'm talking about classical music here). There are also people that aren't touched by any music at all... (yes, they do exsist!! )