[lauradhamilton]

I don't think that will help them. I actually think that's a bug.

Having multiple urls that go to the same place will get you penalized for duplicate content in a heartbeat.

They should actually specific a canonical url for each specific line-number url.

So, I don't think it's a "growth hack"--I think it's an oversight that may cost them.

[jaredmck]

They don't go to the same place - they go to different annotations within the same song which then link back into the full song page.

[tmzt]

Such as linking back to the main song page with an anchor replacing the second part of the URL, similar to Gist links with #L31-style line number links?