Live Nation teamed up with City of Hope to raise awareness and funds for cancer research. Celebrity-designed, collectible ""Hope, Love, and Rock & Roll"" t-shirts were launched in July 2011 as part of this partnership, with 50% of the retail price benefiting City of Hope. Participating artists included: Madonna, Lady Gaga, Journey, Tom Petty, Jimmy Buffet, Barbara Streisand, Rod Stewart, Eminem, Green Day, Kiss, JAY-Z, Justin Bieber, Shania Twain, Sugarland and many more.