Two notes generated fortune (4)
I believe the answer is:
fate
'fortune' is the definition.
(I know that fortune can be written as fate)
'two notes' is the wordplay.
'two notes' means two substitutions for 'note'.
'note' becomes 'fa' (fourth note in sol-fa notation: doh, ray, me...).
'note' becomes 'te' (musical note).
'fa'+'te'='FATE'
'generated' is the link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for fate that I've seen before include "Predestination" , "Destiny, kismet" , "Lot -- doom" , "Predestiny" , "What must be" .)