musician mark cullman is moving on. da lin explains where he's going now. >> reporter: in the hustle and bustle of san francisco, sometimes we forget to slow down and live life. [ singing ] >> reporter: but if you've ever spent time at the ferry building, this voice and his acoustics might have made you stop and listen, perhaps even put a smile on your face. >> just let them know that this is more than just a corporate environment, it's also a human environment. that's what i mean by human. make sure people know individually they're special inside, you know? [ singing ] >> reporter: mark coleman says aside from making a living here, he's been using his music to bring humanity back to a city that can feel transient and corporate. >> it's important for me to push the envelope and make people feel like you're not just a number or employee, but you're a person on this planet. >> reporter: mark moved to the city when he was around 12, but didn't pursue music until his early 40s. for the last seven years, he's been serenading