Conversation so far:
How is Jack Johnson involved in charity ?
In 2008, musician Jack Johnson and his wife Kim created the Johnson Ohana Charitable Foundation, a non-profit public charity supporting environmental, art, and music education worldwide.
Did the musician Jack Johnson donate any money to charity?
Musician Jack Johnson donated $50,000 to GlobalGiving's Japan Earthquake and Tsunami Relief Fund.
Did the musician Jack Johnson help raise any money for other catastrophes besides the 2011 Tōhoku earthquake and tsunami?
In 2012, musician Jack Johnson donated $50,000 for Hurricane Sandy relief.
Did the musician Jack Johnson ever tour and play music for charity?
On September 22, 2012, musician Jack Johnson donated his time to play a few songs at Farm Aid 2012 in Hershey, Pennsylvania.
Are there any other interesting aspects about this article about the musician Jack Johnson besides donating his time to play a few songs at Farm Aid 2012?
Musician Jack Johnson's Ohana Charitable Foundation has also supported Little Kids Rock.

Question: What is Little Kids Rock?
Self-contained rewrite: What is Little Kids Rock in relation to Jack Johnson?