Warm-up is about waking the body up, not winding it tight. A young swimmer logging easy laps and a few build sets wants music that keeps them moving without burning the energy they need for the race. The goal is loose shoulders and a smooth stroke, heart rate climbing a little at a time.
That is why warm-up songs lean bright and steady instead of heavy. A clean groove sets a comfortable tempo on the kick sets and drills, so a swimmer gets to the blocks feeling ready and relaxed instead of already maxed out.
The list

Adventure of a Lifetime
Coldplay
⚡ High Energy“Best Moment
the bright guitar riff kicks
Bright groove.

Watermelon Sugar
Harry Styles
⚡ Medium Energy“Best Moment
the "watermelon sugar high" hook
Bright relaxed groove.

Sunflower
Post Malone & Swae Lee
⚡ Medium Energy“Best Moment
the falsetto "sunflower" hook
Easy bounce.
“Best Moment
the slap-bass groove kicks in
Groove for moving.
“Best Moment
the "pain!" drum hit
Pounding ramp-up.

The Middle
Zedd, Maren Morris, Grey
⚡ Medium Energy“Best Moment
the "meet me in the middle" hook
Bright build.
“Best Moment
the banjo-driven beat drop
Steady momentum.

Uptown Funk
Mark Ronson ft. Bruno Mars
⚡ High Energy“Best Moment
the "don't believe me just watch"
Loose groove.

Can't Stop the Feeling!
Justin Timberlake
⚡ High Energy“Best Moment
the "can't stop the feeling" hook
Light moving energy.

Our #1 pick
Levitating
Dua Lipa
⚡ Medium Energy“Best Moment
the "I'm levitating" chorus
Smooth warm-up groove.
Make it theirs
A warm-up plays better with a swimmer's own name and team in the lyrics, and that is the song we make.