Not sure anyone's heard of this yet, but I just discovered it on the Hal Jordan wikipedia page today. It's a song about Hal Jordan, released as a single by Kirby Krackle this summer, it's not available in an album yet (should be on their next album), but you can listen to it online here. I'm sure I haven't heard all of the GL songs out there, but this one's by far my favorite so far

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