Add contributed sample

O Magnum Mysterium (Brian Schmidt)

Closes #4

Author: 0x2b3bfa0

README.md

@@ -36,6 +36,7 @@ real lyrics, loosely inspired by [OverlappingElvis/blob-opera-midi][2].
 * **[Adeste Fideles][5]** ([_source_][7], [_information_][6])
 * **[Symphony No. 9 (Beethoven)][13]** ([_source_][15], [_information_][14])
 * **[Ave Maria (Schubert)][20]** ([_source_][21], [_information_][22])
+* **[O Magnum Mysterium (Brian Schmidt)][25]** ([_contributed sample_][26])
 
 :book:  **Want to contribute a new sample? Click [here][24]!**
 
@@ -118,3 +119,5 @@ real lyrics, loosely inspired by [OverlappingElvis/blob-opera-midi][2].
 [22]: https://en.wikipedia.org/wiki/Ave_Maria_(Schubert)
 [23]: ./documentation/command#blobopera-recording-import
 [24]: https://github.com/0x2b3bfa0/python-blobopera/issues/new?labels=recording&template=new-recording.md&title=New+recording%3A+%7Btitle%7D
+[25]: https://g.co/arts/8VGdX1SGjm2Tzyee7
+[26]: https://github.com/0x2b3bfa0/python-blobopera/issues/4