Assertion: mastodon | /r/HasProperty | headliner
Facets:
value: at the scion rock fest
type: LOCATION
value: on february
type: TEMPORAL
Source sentences:
text: Mastodon was a headliner at the Scion Rock Fest on February 28, 2009, performing a set containing three tracks from Crack the Skye, the first time these songs were played since being finalized and recorded.