Ny way to easily merge two Pandora stations into a single station

Unfortunately, pandora doesn't offer any really simple way to do this immediately. But there are a few things you can do:

I'm tired of this song means that you like the song but don't want to hear it as often, so that's no help.

The skip button Doesn't have any lasting effects either.

thumbs down and thumbs up are the correct ways to achieve what you want. Thumbs down means that song will never play again, the next song will be rather different, and 2 thumbs down and no thumbs up will ban an artist from the station. Thumbs are pandora's main tool for knowing what music it should play to you and others, even though it takes a while for you to see any effect. :D

You can't really tell pandora to play less variety, but you can only thumbs up songs of a specific type, so eventually it will only play songs like those.

No, Pandora does not go out of its way to not play that song. The explanation is simpler - Pandora can play only songs for which it has distribution rights. For some songs it does not have the rights (usually because of the pricing for the particular song), so while it will create a radio station with similar music, it might never get to play that particular song.