First things first. For anyone out there planning on going to see Bob Dylan at Tanglewood on Saturday night, as I am, I do want to let you know what you are in for, so you don’t come complaining to me after the fact. You will be hearing almost no songs you associate with Bob Dylan. In fact, unless you’re a hardcore fan, you may only recognize one or two of the 20 songs he will probably play on Saturday night. All together, only four songs – only 20 percent of the concert – were originally recorded by Bob Dylan in the 20th century. Fully 1/3 of the songs Dylan will sing are his renditions of pre-rock pop standards typically associated with Frank Sinatra. Fully one-quarter – five songs – of the set will be taken from Dylan’s most recent album of original songs, “Tempest,” recorded four years ago. The concert will feature only two songs Dylan recorded in the 1960s – “Blowin’ in the Wind” and one called “She Belongs to Me.” “Tangled Up in Blue” is the only song Dylan recorded in the 1970s that he will sing. Nor will he so much as touch a guitar. He’ll spend most of the concert singing microphone in hand, crooner style. This will be Bob Dylan like you have never seen or heard him before. Consider yourselves warned.