Our Saturday spherical-up of West Michigan audio information ranges from information about a rocking new exhibit at Grand Rapids’ presidential museum to a next-12 months expertise opposition in Rockford. Milestone Times in History: As observed via legendary guitars.   Awareness, guitar geeks. Assist our protection ofWest Michigan’s audio scene It may possibly not be the first put you’d think about for an show of classic, milestone guitars, but the Gerald R. Ford Presidential Museum in Grand Rapids will concentration on just that starting off later on this month. “America at the Crossroads: The Guitar and a Transforming Nation” kicks off Jan. 27 at the Ford Museum, displaying 40 instruments that…