Starting with a 2015 Tom Petty set in Virginia, Keller Williams’ newest project will be a full PettyGrass tour with Springfield, Mo. string ensemble The HillBenders.

“There is nothing like a room full of people singing along to the same song. With his untimely passing, these songs have been pushed to the forefront of my mind and it seems like as good a time as any to celebrate, publicly, the music of Tom Petty,” Williams said in an official statement.

PettyGrass will be performed at a number of festivals to be announced. So far sets have been confirmed for Redwood Ramble and FloydFest in July. For additional info check the Keller Williams website for updates.

Watch a video of Williams playing a solemn version of Petty’s “You Don’t Know How It Feels,” recorded on the day of the Heartbreaker’s death, here: