such a hard question but here's 5 goodies:

1. "The Triple Wide" - Umphrey's McGee (off of Live At The Murat)
2. "Little Hands" - String Cheese Incident (off of A String Cheese Incident)
3. "Scarlet Begonias" - Grateful Dead (off of The Closing Of Winterland)
4. "Possum" - Phish (off of Live In Brooklyn)
5. "Aunt Avis" - Widespread Panic (off of Panic In The Streets)

there are so many more...