Kevin Manthei did the Spider-Man music. You can stream the music here: http://www.kmmproductions.com/mu_usm_tv.html
There doesn't seem to be a buy option for this one, however the store on the site contains the soundtrack of the game with the same name, which I have no idea if it is identical to the one in the series.
Joseph Trapanese is doing the soundtrack of Tron Uprising and it hasn't been released yet as far as I can tell. Here's his official website: http://www.joecomposer.com/
If you click on the Tron image it will only show some trailer. He hasn't uploaded the soundtrack on iTunes either, you can see that by clicking the iTunes button.