What is the fine-grained topic of the following text: Bassist Johny Chow, who has played with SOULFLY's Max Cavalera and Marc Rizzo (guitar) in CAVALERA CONSPIRACY and is a member of FIREBALL MINISTRY, loaned his skills to SOULFLY for the band's recent touring activities. Only return the topic.
Johny Chow's contributions to SOULFLY's recent touring activities.