哈 (ha4) is from Taiwanese language, meaning "to have a desire for (something or someone)". Thus, 給你哈音樂 means "Make you love music". Some more examples to list: 哈日族 "Japanese-lovers", here 族 (zu2) means "a group of people"; 哈韓 "to love (anything about) Korea"; 哈台 "to love (anything about) Taiwan"; 哈美 "to love (anything about) USA".