You couldn’t make this up. Four bored homeschooled Tyler siblings, ages 15 to 21, recruit a family friend and form a band. First they perform for customers at their parents’ coffee shop. Then they open for Coldplay at a sold-out Madison Square Garden. Lucky? Maybe, but Eisley is no teen flash in the pan. Their self-released debut EP was full of the sort of hook-laden, melodic rock that makes major labels salivate. One did. Marvelous Things (Reprise), their four-song follow-up (an album is due later this year), finds melancholy harmonies only sisters could create, gliding over heavy, yet never heavy-handed, rock backing. Charming without being cloying, Eisley remains all but impossible to resist.