This was one of the first songs used in the Speak Mandarin campaign in the 70s and 80s. This will certainly bring back memories for older readers.
(English translation below)
The country must progress, the language must be communicated
From today onwards, everyone speak Mandarin!
Not differentiating between man and woman
Not differentiating between old and young
No more dialects! Everyone speak Mandarin!
Listen! Memorize! Open your mouth and speak a few lines!
How familiar! How convenient! Simple and easy!
(Repeat again just in case the message doesn't sink in)