Original Music
Logan composed and recorded the TED-Ed Intro Music, which can be listened to in full form here (and in all TED-Ed animations published prior to ~2014). An abbreviated version of the intro music can be listened to here (and in all TED-Ed Animations published after 2014). Logan is also a big fan of the playful, community-based conspiracy theories that have cropped up regarding what happens when you play the TED-Ed intro song backwards.
Logan also composed and performed the score of the feature length film he directed, Darius Goes West. That score is best experienced in the context of the film, which can be viewed in full here. You can also listen to a general version of the score here: