Schlitz’ first hit as a songwriter was Kenny Rogers’ “The Gambler”, which
became a crossover country hit upon its release in 1978, later becoming one
of Rogers’ signature songs. Since then, Schlitz has written numerous country
songs and penned several hits for other country artists. Among his biggest
hits are two Number One songs which he co-wrote with Paul Overstreet,
“Forever and Ever, Amen” by Randy Travis and “When You Say Nothing at
All” by Keith Whitley. He has 24 number 1 hits on the Country Charts.
United States President George H. W. Bush also commissioned Schlitz to
write a theme song for his “Points of Light” program. This song,
“Point of Light”, was a No. 3 country hit for Randy Travis in 1991.
Schlitz also worked with Kenny Rogers again in 1998. Rogers joked at
the time that “every 20 years I will record a Don Schlitz song”.
The result was a hit single called “The Greatest”. Rogers also
recorded several more of his songs in 2013 for his best-selling
You Can’t Make Old Friends album.
https://en.wikipedia.org/wiki/Don_Schlitz
Mason Williams, who wrote Classical Gas, was also the Smothers Brothers' head comedy writer; he also essentially created The Smothers Brothers Comedy Hour. He created the "Pat Paulson for President" campaign, and won an Emmy award for his comedy writing on the show in 1968.
In addition, he helped launch the career of Steve Martin by hiring him as a writer on the Smothers Brothers' show. Initially, Williams paid Martin out of his own pocket.
Here he is performing the song: Classical Gas.
Here's someone a little cuter playing it: Classical Gas - Gabriella Quevedo.