India Envelope And Letter With Printed Stamp From 1937 And 1962?

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It is interesting here that the letter was sent in 1936 from China (Shanghai) via Liberia.
The second letter was sent in 1951 from India.

Religious melody

It is very interesting to me, this religious melody written by the author's hand. Also, the author has drawn lines and music notes. Paper size is 11.5cm x 14.3cm
I suppose this was written in 1963 but I'm not sure. Font color is not the same (pen which are written these two letters, I think differently).

Front side

Back side

It also probably belongs to this, a letter from 1963 because the approximate size of paper, 10.8 cm x 14.1 cm. I still am not sure.
Front side

I suppose this manual work of the author (music melody and drawing) is unique in the world. Probably nothing like that?

It seems that these are two Christmas carrols. I can identify some words Jesus, Bethelem, Weihnacht (German for Xmas Night)....

Hi @Cursus
I looked also, at some words even though I do not understand German (but Google is there to translate).
Here are mentioned: Jesus, Maria, children, heart, door, worship, small children etc...
I've been researching using three types of search engines (Google, Duck Duck Go, Bing). Nowhere I could find something related to "Institutum Franciscalum Missionariarum a Maria". In fact I found a forum about crossword puzzles and words with this title(in Polish).
I've found that this Catholic order composed of Christian sisters. In fact, when I analyzed the letters a little bit, I now assume that the letter was written by a woman.
Incredibly, on the Internet I have not managed to find the mark (emblem) this Catholic missionary order. There is no picture here with this coat of arms.
I'm going to continue to explore.
Best regards

Some further information:
The congregation of the Franciscan Missionaries of Mary was founded in Ootacamund in India by the blessed Helen Philippine Marie de Chappotin of Neuville, religion sister Mary of the Passion who had received January 6, 1877 the authorization of Pius IX to found a new institute specifically for missions as a Third Order.
(Franciscaines missionnaires de Marie) wikipedia

Web site:
http://fmmindia.org/home/home_page

Hi @perf12
Thank you for this information. Especially thanks for the link. I do not know how I failed to find this website (I probably did not use the correct terms in the search engine).
This logo is similar to the logo on the letter.
Best regards