When I was 8 years old, my father informed me that he had just bought an organ and that my brother and I were to start taking music lessons. 10 years later, as I began college, his decision afforded me a well paying job as an organ teacher for Wurlitzer.
Reading music starts right away. This is the treble clef, primarily for the organist's right hand. The lines going up from the bottom are E-G-B-D-F. The memory aid is Every Good Boy Does Fine. The spaces are F-A-C-E. An easy memory aid: FACE.
This is the bass clef, primarily for the organist's left hand and foot pedals. The lines going up from the bottom are G-B-D-F-A: Good Boys Don't Fiddle Around. The spaces are A-C-E-G: All Cows Eat Grass.
In the 80's, while working full time in Hi-Tech, I got a job playing the pipe organ one night a week in a local restaurant. They paid me to do it. Little did they know that, for the opportunity to play a "Mighty Wurlitzer", I would have paid them!
Today, I play what are called "keyboards". Back in the day, the organist was responsible for 100% of the music. Today's keyboards have software that adds accompaniment to what the musician is playing. I now say that the keyboardist is 70% musician and 30% computer operator.