What is the fine-grained topic of the following text: Although his major influences were Hendrix and another RHCP guitarist Hillel Slovak, he has also been inspired by glam rock and avant-garde artists such as David Bowie, T-Rex and Frank Zappa, and lastly by the electronic music of Depeche Mode and New Order, to create a constantly evolving style. Only return the topic.
Influences on a guitarist's evolving style