Even the most emotionally wrenching corridos on El Problema have an effervescent bounce. These unflinching peeks into romantic turmoil come powered by some of the breeziest norteño rhythms around. Fired up by the rambunctious drums and flashy bursts of accordion, you might not immediately grasp the heartbreak roiling through "Me Cansé," at least not until you unpack its anguished tale of estranged lovers. But it's not all pain and loss, of course. "Tranquilo y Sin Hacer Ruido" perfectly complements its sweet-but-steamy celebration of between-the-sheets fun with a sinuously playful groove.