They'll be taking the stage singing show tunes ranging from "Over the Rainbow" to "It's Raining on Prom Night."
Dozens of Moon Area School District alums from years and decades past will take the stage on Saturday for a Christmas season alumni showcase.
Moon Area English teacher Nichole Wilson, a 2004 graduate of the district, said alumni from as far back as 1979 will perform at the event.
"It will be a variety of alumni performing songs from musicals that they were in as students," Wilson said. "There will be different pieces, there are duos performing, a trio performing."
Deborah Kennedy, former director of the districts musicals, will lead the production, Wilson said.
For many graduates, the show will serve as their first time in Moon Area's state-of-the-art auditorium, which opened in 2011 with the completion of its new high school.
"I think that it's going to be really great, from what I've heard people are excited to come back and perform," Wilson said.
Much of the production will come together in the hours before the performance, when alums are slated to rehearse their tunes on the auditorium stage, she said.
"People are rehearsing on their own right now," Wilson said. "And then come in and rehearse that day, right before the show."
The Moon Area High School alumni concert takes place at 7 p.m. Saturday in the high school auditorium off University Boulevard. Proceeds benefit the Moon drama club. Tickets are $5 and available at the door.