Oysterhead [ tickets ]--an occasional collaboration of ex-Phish frontman/guitarist Trey Anastasio [ tickets ], Primus bassist Les Claypool and ex-Police drummer Stewart Copeland--have joined the bill of this year's Bonnaroo Music & Arts Festival.

Claypool will also play his own set during the festival, scheduled for June 16-18 in Manchester, TN. Other recent additions to the bill--which is topped by Tom Petty and The Heartbreakers and Radiohead--include Umphrey's McGee and Disco Biscuits.

Lou Reed [ tickets ] wasn't able to perform two planned concerts--Saturday (2/11) at the Bardavon Opera House in Poughkeepsie, NY, and Monday (2/13) at New York City's Crowbar--due to an undisclosed illness, according to his website.

As it did last year, the once-traveling music-festival Lollapalooza [ tickets ] will return this summer for a single engagement at Chicago's Grant Park.

The event is scheduled for Aug. 4-6--up from two days last year--and will feature 130 bands on eight stages, organizers announced Tuesday (2/14).

Organizers haven't unveiled ticket on-sale information or any of the acts scheduled to perform, but the bill is rumored to include the new incarnation of Chicago-based Smashing Pumpkins.

The new Willie Nelson [ tickets ] digital single "Cowboys are Frequently, Secretly (Fond of Each Other)"--a song that's especially timely on the heels of the Oscar-nominated film "Brokeback Mountain"--debuted Tuesday (2/14) morning on Howard Stern's Sirius Satellite Radio program.

Nelson recorded the song--which was written in 1981 by Texas-born musician/songwriter Ned Sublette--last year during an iTunes Originals session at his Perdenales, TX, studio.

The song is available for download exclusively at the iTunes Music Store.