I'm using the paid version of yousician at the moment so I'm not sure if the free version is the same. If you go to songs and click on the + button. You can add your own songs and play it the yousician way. There's are 10's of thousands even hundreds of thousands of songs in those formats. The backing yousician provides isn't always that great. The app could do with some customization options. But it typically works quite well.
Ibanez SZR520 (Dark Honey Sunburst)
Mitchell HD400 MQOB Transparent Blue, Squire Vintage Modified HSS Stratocaster with Deluxe Player 7 way switch mod. Greco 70's Lawsuit Japanese Les Paul
Marshall CODE 50 Amp