You engage. You interact. You come back. You go to shows. You download from iTunes, watch a few YouTube videos, share a playlist on Spotify and then, lo and behold, you come back to Pandora. It's the type of "daily habit" Marissa Mayer wants Yahoo! ( YHOO) to be. But, she too -- or at least her predecessors -- lacks focus. That's why Pandora wins. Focus. Relax. Remember. Be a good lover, not a stubborn fighter. Follow @rocco_thestreet -- Written by Rocco Pendola in Santa Monica, Calif.