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Less than week left in his historic Hamilton run, Lin-Manuel Miranda has a free Independence Day present for fans: a track with Jennifer Lopez that will benefit victims of the Orlando shooting at Pulse nightclub last month.

“I have a treat for you at noon,” Miranda teased early on Monday morning. “A taste of some new music you don’t need tickets to hear.”

Then at noon, he shared a behind-the-scenes video of him and Lopez recording a song. “Sooo @JLo & yours truly went in on a tune that will benefit [Somos Orlando] here’s a taste!” he tweeted.

Somos Orlando “will address the long-term needs for mental health services that are culturally competent and bilingual” for victims and families of the victims of the Orlando shooting, according to the Hispanic Federation’s website. “Proyecto will enable care to be delivered to those affected directly in the communities in which they live. Beyond emergency assistance, they will be provided with case management, crisis intervention, and mental health services, among other needs.”

Miranda departs Hamilton, the musical he wrote and starred in, on Saturday. The hit show brought home 11 Tony Awards last month, including Best Musical.

What else is on Miranda’s docket? A lot. There’s the Hamilton mixtape; the Hamilton PBS documentary this fall; the Mary Poppins sequel with Emily Blunt; and Disney’s animated project Moana, for which he composed music.