Ras Kass and Canibus make an appearance on Pete Rock and Marley Marl's Future Flavors.
They play a 4 Horsemen track using the same intro beat for 'The Symphony', which might be exclusive (insert KRS drop) to Future Flavors. Next the two drop a verse before the show ends.
Thanks to Greg T for this one...
Ras Kass & Canibus Future Flavors 1999