Looks like people really, REALLY like the theme song for Super Mario Odyssey. While it's fluctuating a bit as the day goes on, Jump Up, Super Star! has been in the Top 40 on the iTunes charts in the United States. That's the ALL chart, not a specific chart. In other words, this is one of the top 40 most popular songs in the states right now!
UPDATE - Looks like Japan has showed us up. On their iTunes charts, the song is currently sitting in the #1 position!