7 hours is the minimum amount of sleep you should get.
For people from 13-25 you should get atleast 10 hours sleep.. **** for everyone 10 hours sleep.
Haveing soft music does not disturb your sleep, you should sleep between the hours of 8pm and 8am, the hours between 12-4am is when your body is in its deepest sleep and that is when things like cell regeneration occurs.
Some people need lots of sleep, other need hardly any, set your sleeping pattern to what makes you feel the best.. Remember the body cannot go into its deepest sleep if there is light.