We love a cappella singing on this site and Will Hamblet told me about this one. It's the theme from the 1967 Spider-Man cartoon show as rendered by a vocal quartet called Midtown. The snazzy video was, they say, shot entirely on an iPhone using the iMessage comic filter.
The original song was written by Paul Francis Webster and Robert "Bob" Harris. Webster wrote the lyrics for three songs that won the Academy Award for Best Song and for one that won a Grammy, along with hundreds of others that were successful. Harris had less impressive credits but I doubt either man imagined the little tune they created for a low-budget Saturday morning cartoon show would have the kind of life it's had…