Types of Fields in Template Editor

[Balok]

Thanks, Andrei. That is more or less what I expected. I usually try to figure such things out by using them, but I didn't quite know how to use the "yellow" ones. Are all the custom fields simple data tags?

All the custom fields I've used are simple data tags. If you're asking whether it is possible to iterate over all the custom fields defined for a track or album, I see no way to do that.

However, most of what I know about writing templates I learned by looking at how the default template works.