When you find yourself trying to remember a show (or any works) that's on the tip of your tongue but just out of reach, come here - the collective brain of the TVTropes community can probably help. Post all the details you can remember (examples help). If you're looking for a trope, head over to Trope Finder. Have general questions about tropes? Visit Ask The Tropers!
According to https://www.tunefind.com/artist/natasha-bedingfield
, versions of Unwritten have been used in the tv shows Medium, Pretty Little Liars, and Cold Case. (I have not watched any of those shows, so I can't vouch for whether or not those are what you're looking for.)
It might help if you can add a little more detail about what year (approximately) you watched the show and whether it looked contemporary or like something from the 90's, 80's, etc...
OMG, thank you guys for your help. Its Rita Rocks!!!
OK, so I’m going to try my hardest to explain this show, I literally only remember tiny bits of it, and it been irking me to find it and watch it because i know I loved the show. I don’t know if i remember watching it on Netflix or on something else but heres what i do remember. I remember one part where it was this blonde woman and she could play the guitar. i think… i also remember a garage being a huge part of the show. i don’t know if she sang in the garage and if that was her thing. I think she was a mom. i remember she had a baby in her arms at one ending of a episode and the song unwritten was playing. For some reason i can remember a mailman… i remember some more little things, if anybody had a clue or idea, please tell me. and if you need to know more let me know.