Paul McCartney will headline Lollapalooza, the US counterculture festival turned Chicago fixture, as the ex-Beatle keeps up an active touring schedule. Other acts announced Tuesday for Lollapalooza, which runs from July 31 to August 2, include heavy metal giants Metallica, Grammy-winning British soul singer Sam Smith and the Belgian dance music star Stromae. McCartney, 72, has an extensive touring schedule in coming months, including headlining spots at Denmark's Roskilde festival and the Firefly festival in the eastern US state of Delaware, as well as a return show in his native Liverpool and his first-ever concert in Seoul. Lollapalooza was launched in 1991 by alternative rockers Jane's Addiction, who envisioned a traveling counter-cultural show as US musical tastes increasingly drifted from the mainstream.