So the music Jason is using is NOT from the "The Great Gatsby" movie soundtrack.
It's may also be the answer to the "Scent of Love" reference.
I did a Shazam of the music and it came up with a song called "Love is Blindness," from the album "Themes Inspired by The Great Gatsby" by a group called The Grey Orchestra.
https://www.youtube.com/watch?v=0YPOt-vgOjM
Here's the whole album from Spotify: https://open.spotify.com/album/7eZSLygEVIkyUkNWRVeXpr
This group appears to do orchestral variations on popular songs and even instrumental versions for karaoke?!. I found a few other albums, including one centered around James Bond theme songs.
I can't find any sort of bio info or who exactly is in this group.
ETA: It gets crazier...so the song is actually a Great Gatsby inspired/Charleston-style cover of "Love is Blindness" by U2 (1991's Achtung Baby): https://www.youtube.com/watch?v=q8_HZ2jG_60
The album is actually Jazz-age remixes of popular songs. Wow. Rohene sure finds the most obscure music.
Although now I think it would have been interesting if Jason actually did a program to the original U2 song, lol.
ETA 2: Mr. P points out this is reminiscent of the work of Postmodern Jukebox, basically the super popular YouTube group that does style variations of popular songs. Here's their "Gatsby" take on Lady Gaga's "Bad Romance."
Aw, man. Love is Blindness is one of my favorite U2 songs. I'd love to see someone skate to the original version of it as well.

