If you love music and you listen to Seattle's KEXP, you probably know who Cheryl Waters is. As an announcer at KEXP, Cheryl has been part of Seattle's musical landscape for more than 20 years. Because of live performances and interviews on YouTube, which she's hosted, she also has a following of music lovers all over the world. But did you know she's a strong advocate for blood donation and a regular blood donor? As Bloodworks 101 producer John Yeager found out, there's a very good reason why.