Unlike most members of this forum, music production is only a distant secondary interest of mine. I am primarily a musician who comes from family-tree of C.O.G.I.C. and Baptist Gospel musicians and singers. Today, I am still active in the Gospel music community via my home church choir that performs often at other venues and two mass choirs (a GMWA chapter choir and regional National Baptist Convention choir), but I also take advantage of Jazz and R&B/Soul opportunities when time permits.
With that said, although all of the above options have contributed to my development as a musician over the past 35 years, the three that had the most impact are "Private Solo Formal Instruction", "Private Group Formal Instruction" and "Other"; which includes playing in church with other musicians and dedicated self-study through various music books.