When Karl Bender, bartender and former indie rock star, discovers a wormhole in his apartment he uses it to cash a few extra bucks charging people to let them go back to relive their favorite legendary rock concerts. When his friend gets stuck in 980 instead of 1980, he contacts Lena Geduldig, astrophysicist, for help aaand you know the rest :)
I felt like the writing and plot progression could've used more work but it's still a fun read.