Marathon -Hq/Insert-Producers: Keith Olsen, D. De Vore, Carlos Santana. Marathon marked the addition of keyboard player Alan Pasqua and singer Greg Walker's replacement by singer guitarist Alex Ligertwood in the Santana lineup. Otherwise, the album was notable for consisting entirely of band written material, although those songs were in the established R&B rock style evolved on albums like Amigos, Festival, and Inner Secrets. The formula seemed to be wearing thin by