I got four pair of ER20 ear plugs from Mike Dimin. I've used them for two weekend gigs so far. These are great! I use to use 31dB foam ear plugs and never realized how much better ear safety could be! I hear more treble, but feel the volume is still at a safe level. I don't know how they would work for singing, but I guess they'd be better that foam cylinder plugs. I gave two pairs away to friends i care about and they both are really excited about playing with these plugs too. For those of you worried about looking "cool", you're not! just kidding. you can get the plugs with clear plastic tips (the part that sticks out of you ear a little) and they are harder to see than a big white or yellow or red or orange foam cylinder sticking out! check out the web page for info... www.etymotic.com then buy from our very own talkbass member Mike Dimin at http://www.michaeldimin.com/estore.htm good prices! order "clear" he says they are the ones he has the most of....THANKS MIKE! p.s. its hard to believe, but i have G.A.S. for custom fit earplugs like the ER15s!!