Took Ma again to an AC/DC show, my first at the giant United Center. Quite an adventure for two small town folks to use a brand new app called "Spot Hero" to find parking and get into the venue. Always great seeing AC/DC, but this was the first tour without Malcolm Young. In addition Chris Slade was on drums, filling in for Phil Rudd. Those missing pieces made the show feel off without a doubt, wasn't the well oiled machine I saw a few years earlier...