DERBY- With their instantly classic debut album, 2005’s “This is the New You,” Derby managed to sound “instantly familiar and yet 100 percent original.” But, as too many bands discover, the sparkling freshness of a new band can fade with the rigors of constant touring and the pressure to release a sophomore album that lives up to the hype. With their new record, “Posters Fade,” Derby has issued a declaration: don’t live in the past when the future is even brighter. Posters may fade, but Derby is as vibrant as ever.