Now, now, if your an hardcore anime fan, I guess it would be impossible if you don't know this dude. Yes it's Doraemon...the round headed cat which have a magic pouch attach to his belly where you can pull many pretty cool stuff/gadgets and all, well, that's him already. Really, Nobita is so lucky to have a friend like Doraemon.
I've heard this music in cello many years ago...probably about seven years ago (I really don't remember) and its really kinda reminiscing when the song suddenly pop into my head again. I just enjoy how a classic anime theme song turn into musical.