Can anyone tell me the name of the incidental music used in the original scooby doo?

Hello Can anyone tell me the name of the incidental music used in the original scooby doo? It is used when ever the gang go and look for clues. It is also used for title screen to the Scooby Doo Movies vol 1. I have also heard It was also used in the first two series.

And can anyone tell me where I might find a download of this or video on youtube.

Much appreciated. I want it for my mobile phone.