We agree, having Green Day would be awesome! I listened to them quite a bit back in the day. Great catchy songs and melodies.

Unfortunately, the songs we get are limited by which publishers / artists are willing to make the songs available to licensing, etc. It's a complicated process, and there are a lot of bands we'd love to have.

In the meantime, we have this Song Request Form. When a list of songs IS available, it helps us choose which to get:

https://guitartricks.typeform.com/to/rmHzhK

-Carl.