Zhè wèi gēshǒu zài yuètán yǐjīng fèndòu le èrshí nián.
This singer has been working in the music industry for twenty years.
Tips
usage
乐坛 specifically refers to the world of music as an industry or community. 坛 means 'platform/arena' and appears in other domain words like 文坛 (literary world) and 体坛 (sports world).