Duet Seed Tracking
It would be really cool if people were able to have a way and track how a duet seed spreads across the platform or where it started it's origins. A lot of singers use the option to seed an open duet along with the completed one they are recording with someone else. Entire additional content categories could spring from the ability to see how far back and with whom the first seed of that branch started and what influences each performance may have had to the evolution and adaptation of the end performance. Just off the top of my head someone could create entire video series' dissecting popular seed branches and exploring the 6 degrees of separation theory between unknown talented singers and some of TS' stars. Or competitions could be held for the longest running original seed of a song with leader boards and statistics showing the growth and adoption of the branch. People singing from larger/older branches go go back to the beginning and 'bring home' the duet with the original performer.. and many other things.. but at the end of the day it would be another tool that helps connect parts of the community that don't yet interact with each other or discover how things truly populate across the network of the sings library.