Correction Ustad Bismillah Khan did not play the oboe . He played the Shenai a wood wind instrument. Here is an excerpt from wikipedia about Puriya Dhanashree. Raga Puriya Dhanashree
The Purvi Thaat contains all seven notes (i.e. Shadja, Rishabh, Gandhar, Madhyam, Pancham, Dhaivat and Nishad). But the rishabh and the dhaivat are komal both in ascent and descent and the madhyam varies from tivra to shuddh whereas the gandhar and the nishaad stay shudh throughout.
In Puriya Dhanashree, however… read more