Here's the pre-release of the descriptor app I made for anyone who wants to add a description to their songs before publishing (here or elsewhere)
It's a Windows stand-alone EXE, meaning there's no installation required, just download and run it.
The way you use it is you load up your .caustic file, add the info you want and press "Add description". When anyone (with C3) loads that file, it will popup a little info card. If the file is saved again in Caustic, the info gets stripped. This is only meant as something you do before sharing.
You'll notice there are two fields for the "Link". The first is for what's displayed, the second holds the link that will be opened if the user touches it. For example you could put "My Soundcloud" in the text field and "https://soundcloud.com/caustic-experiments" in the URL field.
When loaded into the app look like this: (and touching the link opens up the browser on the device)