how to hum like a bumble BEE?

This paper is a part of scientific investigations on Bhramari Pranayama (BP), a yogic breathing exercise in which practitioners imitate humming sound of the bumble bee while exhaling strictly through nostrils. It is still undiscovered why the inventor (ancient Indian Yoga masters) instructed to hum like a bumble bee and not like a common bee or other insects. It is hypothesized that it is the humming sound and humgenic vibrations that are playing key role in bringing many of the claimed benefits of BP. The sound production system of the bumble bee and that of humans are different, however, due to inbuilt complexities and articulatory capacity human´s sound production system can produce variety of sound. Humans can produce humming sound like a bumble bee by sustaining pronunciations of nasal consonants /m/ or /n/ or /ng/ alone or as an aid for continuation of nasalization of vowels or others. The results presented in this paper show sustained pronunciation of /m/ is easier and very similar to that of bumble bee sound in the spectral content. The old texts on Yoga also suggest humming by sustaining /m/ part of the /om/ sound.