The secret is, don't. Use headphone earplugs. Well, unless you're one of those heathens with a phone you can't plug a pair of headphones into.

I have a Sena 20S Evo and it's... tolerable... for intercom duty when riding with friends. You can play music through it, too, but having a middleman with yet another battery you have to manage always seemed silly to me. I use Plugfones with it anyhow, so it's much less of a hassle and you get better audio quality to boot to just plug the 'phones into your audio device directly, stick it in your pocket, and go about your day.