Well, I pretty sure that the best gift without a doubt is concert tickets to their favorite bands show. You can never go wrong with that. If you can get VIP passes that would be heaven, but if you doesn't matter.
If your friends have kids volunteer to babysit give them a night off. Trust you’ll be their best friend for life. The best thing about this gift is that age doesn’t matter, just like music is immortal, so is this opportunity to impress your loved ones sit back and watch the smile.