Instrumentalists: Amjad Ali Khan, Bismillah Khan, Hariprasad Chaurasia, Shivkumar Sharma, Zakir Hussain

Vocalists: Bhimsen Joshi, Ghulam Ali Khan, Koushiki Chakraborty, Rashid Khan

Composers: Bach, Beethoven, Chopin, Mozart

Vocalists: Andrea Bocelli, Luciana Pavarotti

'Adhunik' music
Artists: Lopa Mudra, Hemant Kumar Mukhopadhyay, Sandhya Mukherjee, Shyamal Mitra, Suman
Folk music
Artists: Abbasuddin, Roona Laila
Rabindrasangeet
Artists: Debabrata Biswas, Kanika Bandyopadhyay, Sagar Sen, Suchitra Mitra, Swagatalakshmi Dasgupta

Classic rock, pop, rock, rock & roll, soft rock (these were hard to separate out - so they are all clubbed together)
Artists/Bands: Billy Joel, Bob Dylan, Bruce Springsteen, Cliff Richards, Cranberries, Dire Straits, Eric Claption, Queen, Phil Collins, Pink Floyd, Simon & Garfunkel, Stevie Wonder, The Beatles, The Carpenters, The Doors, Tom Petty & The Heartbreakers, U2
Miscellaneous (yes, I am too tired/ignorant to classify these further)
Artists/Bands: Enigma, Enya, Harry Belafonte, Jim Reeves, John Denver, Kenny Rogers, Norah Jones

Ghazals
Artists: Chitra Singh, Jagjit Singh, Nusrat Fateh Ali Khan
Old film music (both vocal and instrumental)
Artists: Asha Bhonsle, Geeta Dutt, Hemant Kumar Mukhopadhyay, Kishore Kumar, Lata Mangeshkar, Manna Dey, Mohammad Rafi, Yesudas
Composers: Khaiyyam, Naushad, O. P. Nayyar, R. D. Burman, S. D. Burman, Salil Choudhary, Shankar Jaikishan

Artists/Bands: Tinariwen, Youssou N'Dour

Disclaimer: These classifications are entirely based on my judgement. I do not claim them to be scholastic or strict.