I hate Bach Chorales.

They are the most pointless things ever to have been invented - however, the Edexcel exam board deems them to be a useful exercise. I disagree entirely. It's just 8 or so bars of SATB, but you have to fill in the last 5 chords, which sounds easy enough and in principle actually is. But once I actually have to put pen to paper my mind always goes blank. Always. And then I get paranoid that my chord progression is wrong or I've somehow managed to get the key wrong, and then I'm useless. Still, hopefully with practice I'll get better.