Kindly see the embolded phrase below. How's the notion of inventing related to finding? Can you please expound this semantic shift?
A troubadour is etymologically someone who ‘finds’ – that is, ‘composes’ – songs. The word comes via French troubadour from Provençal trobador, a derivative of the verb trobar (whose modern French equivalent is trouver). This seems originally to have meant ‘compose’, and later to have shifted its semantic ground via ‘invent’ to ‘find’. It is not known for certain where it came from, but one theory traces it back via a Vulgar Latin *tropāre to Latin tropus ‘figure of speech’ (source of English trope ). This in turn was borrowed from Greek trópos ‘turn’, a relative of English trophy and tropic. If this is so, its ancestral meaning would be ‘use figures of speech’.
Word Origins (2005 2e) by John Ayto. p 518 Left column.