No guest NOT anyone can learn to do it. It's as if I have a form of musical dyslexia. In general, people who have dyslexia have no problems with pronouncing the words they have learnt by hearing them from others, and they can pick out and identify individual letters. The problem is that they may not always recognise whole words when they are written down and will probably have difficulty pronouncing a word that they see written down that they have not previously heard spoken.

I see my inability to sight read like that. I can (usually) repeat a musical phrase which I have heard by singing it. I can (and usually do) transpose it into a key which is more comfortable for me to sing in. With practice I can play a tune on a keyboard instrument, provided I know what the end product is supposed to sound like. I can even (with a little time) pick out a tune I know. I can identify what each dot on the page means in terms of the key on a piano and the relative amount of time it is played for. What I CANNOT do is look at a page of dots and hear a tune in my head, and if I cannot hear it I cannot play it.