This is how Crash finds Ryan talking to the Dazzlings goes in Ryan's and Crash's adventures of My Little Pony: Equestria Girls - Rainbow Rocks.
[Crash is walking with Sunset]
Crash Bandicoot: Don't worry, Sunset. Everyone will remember you and Cody after I find out if Ryan is friends with the Sirens. And when they are reformed, no one will let them forget it.
Sunset Shimmer: That's nice of you, Crash. Let's hope Ryan is immune to their singing.
Crash Bandicoot: Well, I found out that Ryan's not immune.
Crash Bandicoot: [hears singing] What is that singing? I'll go find out. See ya, Sunset.
Sunset Shimmer: Ok, Crash. Good luck.
[Crash follows the singing and finds the Dazzlings singing to Ryan]
Crash Bandicoot: There's Ryan with the Sirens. I think they are sirens. Maybe I'll get closer, just to be sure.
[Crash went closer]
Crash Bandicoot: [in mind] What is Ryan doing under their spell?
Ryan F-Freeman: I adore you, my siren friends...
[Ryan snaps out of his trance]
Crash Bandicoot:[in mind] What does he know the Sirens?
Ryan F-Freeman: Well. I think you did well against the other bands in the first round, girls.
Sonata Dusk: For realsies?
Ryan F-Freeman: Yes, Sonata.
Crash Bandicoot: He's nice to the Dazzlings?
Adagio Dazzle: Thanks, Ryan. When we win, you will serve us as our
Crash Bandicoot: [in mind]