Hardcore, emo, pop-punk ... whatever you call it, tuneful rock and roll (a fair definition of "pop") has its share of followers, and performers, in South Florida. Few of the performers are as accomplished as the players in Sunday Driver. Since forming in 1999, the Sunny Isles Beach quartet has released an EP (Third Place Prize) and, this past February, its debut full-length, A Letter to Bryson City, to growing national acclaim. What's the secret? Lots of cross-country tours promoting a sound that balances Alex Martinez's melodic vocals with his and Charlie Suarez's blistering twin-guitar attack. If popularity is the end zone, these cats are in the red zone and it's first down.