'Parks and Recreation' wrapped up its sixth season last night with an all-star concert featuring some indie-rock greats. Wilco's Jeff Tweedy -- along with the Decemberists and Yo La Tengo -- appeared onstage for the Pawnee / Eagleton Unity Concert that's been a long time coming.

Tweedy, who showed up on an episode a couple weeks ago, played the frontman of the reluctantly reunited Land Ho! The other guests joined them onstage for a tribute to Pawnee's departed miniature horse Li'l Sebastian. The song, 'Five Thousand Candles in the Wind,' was accompanied by an epic hologram of the beloved mini horse.

R&B singer Ginuwine was also there, performing his hit 'Pony' (for Li'l Sebastian, of course), as were the Decemberists ('The Crane Wife 3') and Yo La Tengo (who covered Night Ranger's 'Sister Christian'). Nineties alt-rockers Letters to Cleo showed up too.

You can watch the entire hilarious episode above.

And here's Tweedy's first appearance on 'Parks and Recreation' from a couple weeks ago: