Inland letter card from India with Indira Ghandi imprint
It appears that the instruction was cancelled and the letter card sent on it's way without the required rate of 15 rupees. The "Return to Sender" element of the handstamp had me thinking of immediately of Elvis Presley whose song of the same title was a huge hit in the early 1960's and is probably the most famous of all songs with a postal theme in it's lyrics. Then came the challenge...how many postally related songs can you think of? Well...there was the Carpenters with "Please Mr. Postman" (which I think was originally a Beatles song)...and...and. A quick "google" produced little information. Ella Fitzgerald sang "Air Mail Special" and there was an Indy pop band by the name of "The Postal Service" who were active around 2005. So, its over to you for more suggestions!
The Victorians, for whom the postal service became a national obcession, produced lots of postally related songs: "The Postbox Polka"; "The Postman's knock" and "The Royal Mail Galop" appear to have been popular songs and tunes of their time.
"The Postman's Story" (illustrated left) was a ballad that told of drowning on a sea voyage to America and very little to do with the postal service. It tells of an old man awaiting his postman to deliver a letter from his son who was lost at sea. However the use of the postman illustration on the sheet music proved a positive marketing ploy and it appears to have sold well as a result.