The story goes:
A failed songwriter/singer is hit by a bus. When he recovers the world he knew is bit different now - an alternative history seems to have happened (i'm guessing the Mandela Effect was the inspiration?). People are not familiar with many things (i.e. Coca-cola) or bands for that matter, like The Beatles. And he knows all their songs.
IMDB rating is bit low - probably not enough car chases? But for me it was fun to watch each time. Really liked Himesh Patel performance BTW, they should cast him left and right - laid-back yet intriguing . Lily James as his first manager is super charming IMO.
Needless to say, you will hear plenty of the Beatles songs on the way.