This is actually a really hard question for me! There are so many amazing songs, and it's so hard to choose just one! I love a lot of Taylor Swift songs, and I love to dance to new Pop songs. I'm going to put them in different categorizes:

50s song:
Sh-boom

Older Song:
True Colors by Cyndi Lauper

Sad Song:
Ronan by Taylor Swift

Makes me want to dance song:
I'm Only Me When I'm With You by Taylor Swift

Pop song:
Sugar by Maroon 5

Favorite song to sing:
A Little Too Much by Shawn Mendes

If I HAD to pick, my favorite song would have to be True Colors by Cyndi Lauper.

Thanks @DeadliestSeahawk13 for asking!