FATpick's animated, flowing tablature and real-time performance feedback is a fun and intuitive way to learn to play new songs on guitar, bass and other fretted instruments. But what songs are available, and where do they come from?
What songs are available?
The short answer is maybe "any" or "every". You can add your own songs to FATpick, almost instantly, by importing any score in the Guitar Pro format. See Edison's post for detailed instructions on how to add songs to FATpick.
Many users do exactly that. Of the users that have created accounts this year, more than 40% have imported their own songs to play in FATpick. As I'm writing this, collectively they've added more than 400 songs so far. That's more than 1,300 tabs to play, almost 100 continuous hours of music. And new songs are added every day, so the number will be bigger by the time you read this.
So you don't need to go searching for Guitar Pro files to take advantage of FATpick. In fact a slight majority of FATpick users have never imported songs of their own, and instead play songs from the shared library.
When you import a new song into FATpick you have the option to add it to your private library - the list of songs that only you can see - or to make the song available for other FATpick users to play.
As above, new songs are shared every day, so this number will be out-of-date almost as soon as I write it, but currently (March, 2021) there are more than 250 songs (and more that 1,000 playable tabs) in the public catalog.
The best way to explore what's available is in the app itself, where you can search, browse and filter the list of songs on a number of dimensions. But if you'd like a preview, you can search an up-to-date list of the songs in the shared library to see what songs are available and which tracks (instruments or parts) they include.
Where do they come from?
The songs in FATpick's library are added by users like you that import a transcription in the GuitarPro file format and share it with the community at large.
Guitar Pro is an extremely popular format in the tab sharing community. There are at tens of thousands of song transcriptions in that format available online - some say 100,000, 200,000 or more. So it's no surprise that there are an enormous number of places to find GuitarPro files online. Some are better than others. While I don't want to endorse any particular site (since I haven't really vetted any of them), a couple that I've found convenient are GuitarProTabs.net and GProTab.net. Each seems to have a large collection of decent quality transcriptions and neither makes you jump through a bunch of suspicious hoops to get to them. Ultimate-Guitar is another great source for quality Guitar Pro tabs, if you pay for a premium account with them.
UPDATE: For a more detailed review of online sources for guitar transcriptions in the Guitar Pro format, see this follow-up blog post: Where to Find Guitar Tabs
If you'd like to try your hand at creating tabs of your own - or modifying tabs you've found - there are several ways to go about that also. Two of the leading ones are GuitarPro itself, the powerful commercial score editor that defines the de facto standard tab file format and TuxGuitar, an open source alternative that can read and write files in the GuitarPro format and a bunch of others.