Written and composed by Rokusuke Ei and Taku Izumi (永六輔 . いずみたく), each of these representative songs would feature what that particular prefecture's most well known for, be it landmarks, temples, etc. In Ibaraki's case, its Mt Tsukuba... the Shiroku toads and the Shiroku toad oil from Mt Tsukuba. What's so special about these toads? Like their name Shiroku (四六), they've got 4 fingers/toes on their front feet and 6 on their hind feet. Well, that's about it. And if you're wondering about the toad oil, its just some ointment for your skin... nothing too nasty, I hope.
Anyway, 'Tsukubasan Rokugashodan', released in 1970, is basically about a frog chorus group from Mt Tsukuba and the 4 members consisted of, surprise surprise, a Top Tenor, Second Tenor, Baritone and Bass. In this little jig, these frogs/toad introduce themselves through song, and each part to be sung - or should I say, croaked - by the corresponding members of Duke Aces. For example, Baritone Michio Tani (谷 道夫) would sing the part of the Baritone frog in the group.
So for about 90% to 95%, the Aces would just just croaking away and I suppose showing off their vocal range too. Cute and rather zany, it actually sounds more like something you'd hear at the start or end of a kiddie show like Sesame street, with the day's feature being frogs.
Frankly, I wonder if Ei was just bored from writing proper songs that he decided to do something different for a change. A+ for creativity? Despite how strange the song is, it was one of the more popular songs from the 'Nihon no Uta series' other than 'Ii Yu Dana' and 'Onna Hitori' that represented the Gunma and Kyoto prefectures respectively. In fact, they even sang it once on their 7th appearance at the 20th Kohaku in 1969!
The best part of the song would be when all 4 Aces start bouncing up and down mid-song. Yes you read right, elderly men in suits jumping on the spot like frogs on stage. It was all the more hilarious to see my favorite Ace (for various reasons), the stiff and mostly aloof Yoshitaka Makino (槇野義孝) doing just that.