"There's not anybody I ever heard who sang with more truth and passion than Gregory," says Allman co-founder
Fans asked to gather along procession route to cemetery to honor Allman Brothers Band leader
Songwriter pens touching tribute to late friend, frequent collaborator
Trio honors Southern rock legend with Charles Kelley-led version of "Midnight Rider"
Watch the group play an epic rendition of "Trouble No More" before taking their final bows at New York's Beacon Theater
Anastasio's outfit delivered concise, lively version of Allman Brothers classic
"When he opened his mouth and started singing ... there was this honesty that made a connection with people that was undeniable"
"The Allmans were playing music I understood," Black Keys singer-guitarist says. "[They] resonated with me because it felt familiar"
Country's proto-rebel, who married classic country with Southern rock, once recorded Allman's "Come and Go Blues"
"We were fortunate enough to have been touched by him and those moments remain treasured encounters," ZZ Top guitarist writes
Singer wrapped up his Holdin' My Own Tour with epic 42-song set
"Gregg Allman was not only a friend and brother, but he was a strong inspiration to me very early on in my career," keyboardist writes
Charlie Starr remembers "one of the absolute coolest rock & roll guys to have ever walked this earth"
"He wrote these amazing songs that were as natural as his voice was," Allman Brothers guitarist writes in tribute to band mate
From Chris Stapleton's "Whipping Post" to Eric Church's "Ain't Wastin' Time No More"