this is a cool thread! i liked what everyone has contributed and just read the article mentioned above. it says intonatsia is an articulated concept in russia (i would tend to agree, though my husband wasn't born there, that every russian musician seems to have that extra 'drama' if you want to call it that). i didn't realize they talked about the concept.
for theorists, it said that in compositional technique 'intonatsia' governs intervallic relationships. and, that it is 'codified' (the musical tension that governs these relationships). therefore, musicians can hear 'musical whispers, cajoles, rages, sighs, ponders, shouts, seduces.' this is such an idea to musical memory. i was impressed at the teacher who learned all the goldberg variations in one week! so this is how they work...doing all together (not separated) memory work (hearing phrases and playing them like a picture of a face). interesting! (maybe we tend to give students less credit than they are capable of - one thing at a time instead of the whole)>
in mozart, i was reading for my class ' four types of rubato were applied in mozart's time, the most common involving a natural flexibility of the prescribed melodic rhythm (very appropriate in russian music - since it is often folk tunish and rhythmic to the words or idea) within a constant tempo, chiefly in slow movements. mozart was acclaimed for his exploitation of this technique. other types of rubato commonly practiced included the modification of dynamics, the written-out displacement of natural accents, and the flexibility of actual tempo by introducing arbitrary, unwritten accelerandos or ritardandos to clarify phrase structure.'
my husband sang as a choirboy for many years. by listening to the older people in the choir, he became aware of the audience (as mentioned in another thread on how pianos are heard in various concert halls) and what they hear and not just what he hears. so everything is exaggerated (not too much). he takes time when slowing down or speeding up so each note is heard.