I'm currently ranked 101 on Whip It Expert, Pro Keys on Rock Band 3 for the Xbox 360. That will probably change very, very quickly and the song was very, very easy, but still, not bad for an hour or two in. It's definitely the highest I've ever scored on any leaderboard on the 360.
Edit: 363 on the Panic Attack Expert Guitar leaderboard. Somehow. I'm guessing that there's only 363 entries on that leaderboard.
Edit 2: Ranked 45 on Before I Forget Expert, Pro Keys. Now that's my bestest evar. It's a very, very easy song, easier than Whip It, but it's still fun to see double digits like that.