There are lot of great singalong songs — “Don’t Stop Believin’,” “Mr. Brightside,” “Bohemian Rhapsody” — that everyone jams to when they come on the jukebox. But most nights, shelling out a dollar to play a song from Rent or The Rocky Horror Picture Show would draw the ire of your fellow drinkers. Broadway After Dark Singalong: Yinzcon edition is not most nights. Grab a card and belt out a song from The Book of Mormon or Avenue Q at the Hard Rock Cafe, as part of Yinzcon, Pittsburgh's annual Rocky Horror Picture Show convention.