Straying Mantra

"When mantra rituals are accompanied by music that is not to make them more appealing or more impressive. The great master Guru Rinpoche said:

To use music in secret mantra, swiftly invokes the blessings.

"If the styles of chanting and playing music which come from the vidyadharas of the past are maintained properly, they will bring great blessings. If not, just to make a loud noise by chanting the text to all kinds of tunes and playing different musical instruments, without following any genuine tradition, is what is known as 'secret mantra straying into occultism,' and something to be avoided."

-- The Mirror Clearly Showing What to Adopt and Abandon
Kyabje Dudjom Rinpoche