乐行忧违

Explanation: That the music thing to do, is to avoid the worry about things. The phrase "easy to do": "Music is the line of, worry about the violation of." 　　Source: Phrase "easy to do," Music is the line of, worry about the violation of. " 　　Examples: Not only multi-rhyme, suppression and multi-purpose even, that as '~', even him; 'long man Heli', even also. ★ Qing Ruan, "said classical"