I've always considered reels to be in 2/4 meter and hornpipes can be 2/4 or 4/4. And then there is 'cut time' which is written as 4/4 but instead of designating the meter as 4/4 or C the C has a vertical line through it (the cut) and you are supposed to play the tune as though it were 2/4. Sylvia Miskoe, Concord, NH USA