What a difference eight months has made for the Goo Goo Dolls.Eight months, some time off, a strong new upcoming album and the start of a new tour, that is.After a solid but hardly soaring show at Bethlehem's Musikfest festival in August, The Goos returned to Bethlehem on Sunday for a show at Sands Event Center that found the band stronger and sharper than they've appeared in years, seemingly energized and invested -- especially in the new music, which also is the band's best in years.In an 85-minute show, the Goos played 21 songs -- including five from the new album "Magnetic," due out June 1