Editor's Note: First Notes is a weekly update of recent happenings in the world of music.
* Eleven people were arrested at the Jay Z and Beyonce concert in Los Angeles on Saturday night, including one man who bit off another man's finger. During the show, Roberto Alcaraz-Garnica allegedly groped a female concert-goer. When her boyfriend confronted him, Alcaraz-Garnica bit off the tip of his finger. Alcaraz-Garnica has been charged with “suspicion of sexual battery and mayhem, legally defined as disabling or disfiguring a part of a victim’s body.”
* A second person has died after attending the Mad Decent Block Party. An overdose is suspected in the death of a 17-year-old at the tour's stop on Friday in Maryland. This is in addition to the person who died and 20 who fell ill at the event.
* The ashes of DJ Alan Freed, who is credited with coining the term "rock 'n' roll," will be removed from the Rock and Roll Hall of Fame in Cleveland and returned to his family. The family feels Freed is being evicted, but the Hall of Fame says he will still be featured prominently.
* Slipknot released its first new music since the death of bassist Paul Gray, and first since 2008, when the band posted a new track, "The Negative One," on its website. The song is also the band's first without drummer Joey Jordison who left the group in December of 2013.
For some background, Joseph and Dun hail from Columbus, Ohio. They started the musical duo…