This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Whenever we have a clause modifier it goes almost always after the noun. In this case it does.

So the sentence would be:
The lecture on Philippine music was cancelled.