Tilt Brush is one of the best apps for the HTC Vive. Drawing in 3D space and being able to walk around it is truly an amazing experience. It's one of the apps I usually show off when demoing the Vive.
Google has released a new update that takes a song from your computer and adds some reactive animations to the brushes available. It really adds some pop to your drawings and I can't wait to see some folks take advantage of this new features. Check out it out in action and see how it can bring some drawings to life.