Dissing on Sesame Street... not cool.
A lot of the artists who appeared on early Sesame Street episodes were New Yorkers in the local jazz/indie/folk/rock scene as well as international artists... they've had a huge variety of talents on, Billy Joel, Paul Simon, James Taylor (the guitar riff for "Jellyman Kelly" is a particular favorite... simple, quirky, catchy and fun to play), Johnny Cash... a number of noted opera singers, jazz musicians and instrumentalists, as well as lesser known folk singers... oh... like Buffy Sainte Marie?
The breadth, depth and variety of the musical talent that has appeared on Sesame Street over the years is far above and beyond your typical three-chords-and-a-chorus hacks... Just because they also have pop singers on from time to time doesn't change that fact.
I grew up on 70's and 80's Sesame Street, and some of the instrumental riffs and older songs were downright amazing. It's cool to see people lend their talents (for free) and do such excellent work for something so simple as a children's TV show...