The Grateful Dead performed at Barton Hall, Cornell University on May 8, 1977. It is widely regarded as their greatest concert, although that is understandably contested since they did perform over 2000 shows.
I have compiled a comprehensive list of about 100 ringtones from that night that are ordered by song in a neat and easy to understand app. Each song has a small story as well as a more detailed overview that you can read on another screen. Each song screen has a scrolling view for the sound list and the description if necessary.
It is no replacement for the full songs but a great addition to any deadheads collection.