NEED HELP FINDING OUT WHAT SONG THIS IS BY GUITAR RIFF?

I hear this awesome guitar riff in this song where I work. We only play music from the 50s to 70s so I know the timeline its in. The only way I know how to describe it is to put the numbers in- the higher the number, the higher the note. 1 2 6 4 3 2 1 2 6 4 3 2- something like- doo doo DOO DOo Doo doo- please any attempts will be appreciated