Stellar objects and radio waves?

I always wondered, when hearing stellar bodies like pulsars, quasars and black holes emit radio waves, the following:

1) Are these waves akin to AM/FM/VHF/UHF type signals in that they transmit signals and sound?
2) If not, are these "waves" just variations in the redshift of hydrogen?
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What is a Mexican astronomer's favorite food?

A Quasar-dilla.

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