Probably not even a lot of Japanese now are aware of this, but the theme from "Shoten" actually has lyrics written by Takehiko Maeda（前田武彦）. And for the first little while, it had been sung by Maeda and the actual comedians appearing on the program, but with the change in cast, it switched over to the current instrumental version. I couldn't find the original version but with the help of special guest star, Miku Hatsune（初音ミク）, I can give you the sung version.
Now, what is this "Shoten" all about? Well, it's (according to Wikipedia) the 2nd-longest running Japanese TV variety program, starting in 1967 and continuing every Sunday in Japan at 5:30 p.m. on NTV. So, before the anime hour on Fuji-TV (Chibi Maruko-chan/Sazae-san), I often caught this show. Basically the format is this: six rakugo storytellers in front of their head honcho, himself a rakugo veteran, are given situations for which they have to instantly come up with a funny pun or witticism. There is one more storyteller at the other end by the name of Yamada who seems to just cheerfully give out and take away the zabuton...which brings me to my final point. A storyteller who makes an especially funny joke will earn a sitting cushion, but if he gives a lousy punchline, then the opposite happens. Earning ten zabuton will get that storyteller a prize.