Which is why when a segment on the TV show features Fallon, as Neil Young, singing a song using the lyrics from the Double Rainbow Guy YouTube sensation, the real success will come online.

Fallon has played Neil Young a couple other times (more background from the Late Night blog) but this was the first song that was generated by a purely internet creation. Either way, Fallon is amassing quite a few musical hits through Late Night sketches.

It’s one thing to hear the Double Rainbow guy ask “what does it mean?” and say “It’s starting to look like a triple rainbow,” but it’s entirely different to hear Neil Young sing it.

Check it out (h/t Nothing’s Good):

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This one from earlier this week combines a great song, a funny and unique concept and perfect execution – all the makings of what separates Fallon from his competition in what works for the web.

Here’s Fallon, as Neil Young, singing the theme from Fresh Prince:

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