as someone who, whenever possible, presses play as the first thing when i get up and presses pause as the last thing before i go to bed, i must confess that i do get irritable when i don't get listen to any psytrance for a day.
also, when i haven't listened to music for a few days and then put on headphones i trip out a lot more than usual. so we have withdrawals and tolerance development. two clear indicators of addiction