joe knows a thing or two about the instant fame "the voice" contestants may be facing. >> the jonas brothersvin. >> nick. >> hey, everybody. i'm joe. >> the jo bros were barely known in '06, when suddenly it was like this. ♪ >> sold out arenas, a concert movie and screaming fans. >> do you think you could have made it on the show? >> oh, yeah. >> i would like to believe so, but it's one of those things there is so much nerves and it's a scarry thing. for a lot of people, you cross your fingers and say, i think i could do it, but what they are going through is really intense. ♪ >> joe and his current band, d.n.c.e., performed on "the voice" in may. but he and adam were hanging back in the day too. >> we bumped into each other a hundred times. >> you were making it, and we were making it. we would see them everywhere. ♪ >> following a prince concert. >> award shows. bowling alleys. >> a bunch of places. >> adam will also once again be hanging out with miley cyrus who hasfy yan say liam hemsworth on her mind. she wrote, we miss you because he is in new york filming, and isn't it romantic? >> i