Whilst researching his 2011 Biography 'This Is A Call: The life and times of Dave Grohl' journalist and writer Paul Brannigan spoke briefly with Barrett Jones. During these conversations Jones mentioned to him that during a session in October 1989 Grohl recorded a solo cover of the theme tune to the TV show Charlie Brown. It is presumed Jones was referring to 'Linus and Lucy', the instrumental song written by Vince Guaraldi that featured in 'A Charlie Brown Christmas'.
He did not mention any other tracks recorded at this session nor if a recording still exists but it is likely that it does.