Madonna

The 64-year-old singer's latest tour, "Celebration," was supposed to kick off in mid-July. As a result of the illness, which put her in a hospital ICU, Madonna has postponed her international tour.

Seymour Stein, who helped found the Rock and Roll Hall of Fame Foundation and was himself inducted into the Rock Hall in 2005, died of cancer in Los Angeles, according to a statement by his family.

In his autobiography, Siren Song, Stein writes about how he started out in the music business as a teen before going on to sign groundbreaking artists like Talking Heads, Madonna, Ice-T and k.d. lang.

A New York City hospital has created a playlist of songs with the ideal tempo for CPR, although previous research suggests there is more to good chest compressions than just the right tempo.