As if to say acquiring the ability to really listen is an accomplishment, which would tie in to the next line,
"When you live underground, it's the way that you see,"
If you were to actually live underground, it would take more listening to get around rather than seeing, which would increase your ability to hear things and listen to things. Although the song isn't literally talking about living underground, I think it's talking about being a lonely person, or just isolating yourself.
What I hear is:
"Listening is really just a fabulous feat,"
As if to say acquiring the ability to really listen is an accomplishment, which would tie in to the next line,
"When you live underground, it's the way that you see,"
If you were to actually live underground, it would take more listening to get around rather than seeing, which would increase your ability to hear things and listen to things. Although the song isn't literally talking about living underground, I think it's talking about being a lonely person, or just isolating yourself.