Adjust draw lessons.
Add clap lesson.
Improved music activities.
Add clap lesson.
More jam material
Second tree thumbnail
Jam tweaks
More music.
Fix queen song.
Everything is awesome.
Adjust order
Fix language in Jam.
Fix styling: limit ref popup to 640px
Add refs to snowman activity.
Update based on feedback.
Update silence.
reflist work.
Reference index.
Move chevrons
Move close box.