Signature Theatre is ending its 2011-2012 season with a rousing tribute to the disco era, complete with roller skates, mirrored balls, leg warmers and glow sticks: “Xanadu,” a musical so big and glitzy it seems as though it should have an exclamation point after its name.

“Xanadu” has an illustrious pedigree, having appeared in several early cinematic guises and having won prestigious awards on Broadway in 2008. Written by Douglas Carter Beane, with music and lyrics by Jeff Lynne and John Farrar, “Xanadu” is a tribute to the power of absurdity, fantasy and love.