With a series of annual high-spirited end-of-year shows filled with fans who can belt out most of the band’s original 60-song holiday catalogue, the Ohio City Singers have established themselves as a seasonal staple. Comprised of an all-star cast of Northeast Ohio rockers who take time away from their individual projects to embrace the magic of the holidays, the 10-member supergroup performs at 8 tonight at the Rock Hall. Local writer Annie Zaleski will be onsite to sell and sign copies of her book This is Christmas, Song by Song.