From Longman Dictionary of Contemporary Englishthe heartbeat of somethingthe heartbeat of somethingAmerican English the main origin of activity or excitement in a place or organization → heartbeat
Examples from the Corpus
the heartbeat of something• The timeless street has been the heartbeat of popular music, and source of countless classics.• Broadway has long been the heartbeat of popular music and the source of countless classics.• Trondur had compared the movement to the heartbeat of a great animal. 