a land of

It was a white audio cassette tape.

On the tape there were many songs including Nellie the elephant, never smile at a crocodile, but there was one song, I believe it had knights and castles involved, something about dreams, rainbows, I just can't remember...colours...in a land of colours and dreams....something like that

I can't remember, it was a tape that I loved and kept my spirits high, but my mother thought I was too old to listen to such things so she threw it away. I really want it back. Many many many years later.

What was the song? Any help?