The problem is organs are capable of putting out a lot of harmonic overtone series. So it can sound busy in the way a 12 string sounds busier than a 6 string guitar - twice as many notes. Depending on the organ settings one key depressed can cause several notes to come out. For some this doesn't matter but for me it sounds terrible. Overkill, confused and busy. And of course if you ever spent any time at a roller skating rink, and I did, the associations make this sort of organ setting sound really tacky. The organ on the 45 sessions is not as bad as some from the period, IMO.