Posted to themes  inchoate 

Pronunciation:
\in-ˈkō-ət, ˈin-kə-ˌwāt\
Function:
adjective
Etymology:
Latin inchoatus, past participle of inchoare to start work on, perhaps from in- + cohum part of a yoke to which the beam of a plow is fitted
Date:
1534
: being only partly in existence or operation : incipient ; especially : imperfectly formed or formulated : formless , incoherent <misty, inchoate suspicions that all is not well with the nation — J. M. Perry>
Often times a song will spring from a songwriter fully formed.  Comparable to giving birth to a child, or receiving the song on some private wavelength.  Songwriters speak of how these songs seem to come from outside of themselves, and once birthed, have a life of their own.
Other songs, however, life with the musician through many iterations before finally becoming the tune known to us.  Their beginnings may be radically dissimilar in tune, lyrics, arrangement, mood, perspective, etc.  Some such versions are true diamonds in the rough, and in many cases contain a raw essence that revision has dimished.  Such diamonds can be found on box sets, bonus tracks, or bootlegs, and they are often a fans greatest delight.