You can learn to make this connection. Most people don't realize that music is not just an art, but a science too. If you don't know the names of the note's letters (the keys of the piano), you will need to learn these. Once you do that, you will need to learn what notes make up chords. Playing by ear is about learning the relationships between notes- the distances between them. If you can take a sightsinging class at a local music studio or a college, I would recommend that. I took piano for a very long time (over 10 years), but I could not play by ear at all.... then I took some sightsinging classes. Sightsinging teaches you to sing a piece of music that you've never seen before, and it does that because you learn to analyze the piece by the key that it begins, and then you keep going up or down each note, and you get better with practice (It's easier than it sounds) How does this relate to playing? Even if you are not a singer, those skills that you learn in a sightsinging class- what a song sounds like, how to analyze what key it is in, etc.- that will help you play by ear. Just trying to play with the radio to learn - you can try that, but believe me, it will take forever, and it isn't the quickest way to learn how to play. If you don't have access to a class, you can go to your local music store, tell them you want to learn how to play by ear, and they will probably show you some software to teach you sightsinging (aka "aural skills"- aural meaning ears). Yes, some people are born with the ability to play by ear, but everyone can learn how to do it. Not everyone will be as great at it, but with time, effort, and practice you can learn it. If any of this is unclear, or if you don't understand what I've written, go to your local music store, and ask a staff member- they can clear up the confusion! Good luck!