Probably an uneducated DJ and / or poor quality equipment. but then again this is what sells to the yonger crowds.

http://www.youtube.com/results?search_query=all+about+that+bass+lyrics
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Bill in SC --- Roland BK9 (2) Roland BK7M, Roland PK5 Pedals, Roland FP90, Roland CM30 (2), JBL Eon Ones (2) JBL 610 Monitor, Behringer Sub, EV mics, Apple iPad (2) Behringer DJ mixer