It's not a lyric from this song, but this translation reminded me of "Wenn sie tanzt", a song by German singer Max Giesinger.
You can find the lyrics here, if you want to check your listening comprehension! I find his songs to be quite clearly pronounced. You may be pleasantly surprised to see how much you can understand based on your knowledge from Duolingo :)
Yes! I heard this song long ago when I was learning German from Duo. Imagine my delight.
There is no "then" equivalent needed in the German sentence, otherwise it'd be something like "Wenn sie tanzt, dann tanze ich".
I agree with David. It should be "If she dances...", not "When...".
"wenn" can be used at when, if it is not a question but a statement "wann" is when as a question. thats when it gets tricky, because "wenn" is also if. i think it needs context