Whether they're made for Summer or just have the Summer feel these are the three musicals I've found to be lighthearted and simply fun!
P.S. The music ain't bad either. ;)
Mamma Mia! {2008}

Grease {1978}

Walking on Sunshine {2014}

If you have any you'd like to add, please do. =)
Any recommendations would be welcomed.
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2Opinion
If someone doesn't admit they like Grease at least a LITTLE, be wary of that person. :P
there was a sequel to grease, grease 2 which was also pretty good.
I watch grease once or twice a month lmfaoo