Actually, a bass player. That was one of the first bass riffs I learned . . . along with the ones from "Money" and "Roundabout." I saw Jethro Tull 3-4 times in the 1970s, easily the best show of that era.Haha ! you must be a drummer ! What an odd time measure
I usually don't count during my runs, but it seems to me that it is more like a 3/3 or 4/4, depending on the terrain (flat/downhill or uphill)