Sorry Shuckins for not noticing this thread before, although I'm almost loathe to enter into the discussion.
To answer your original question, i.e. what's going on in church music and the related question of what is going on in worship generally in the modern church requires a little background. I'm only going to go back to the 19th century, to keep the discussion shorter than book length.
Basically within Christianity there were two competing theories regarding what we should do in worship.
The first theory was that the bible should determine what we do in worship, and that if we couldn't find a command or an example that would indicate that the New Testament Church did it, we shouldn't either. This was the practice of the American denoms that had descended from the Puritans and continental Reformed - the Congregationalists, Baptists, Presbyterians, Dutch Reformed, etc. In terms of music, most of these groups initially believed only in the congregational singing of unaccompanied Psalms and Hymns, that meant no bands, no soloists, no choirs, etc. just the congregation singing to fairly simple tunes. In this worship the preaching of the word is central.
The second theory was that the church had the right to create rites and ceremonies of its own and then require the congregation to observe them. This would be the worship theory of the Lutherans, Catholics, Episcopalians, and Methodists. In terms of Music, accompanied singing of hymns, including choirs and soloists on special occasions were widely practiced. Worship in these traditions is highly symbolic and often referred to as "high church." In this worship the ceremonies and sacraments tend to be much more important than preaching.
Gradually, in the late 19th century and early 20th century as the authority of the bible began to decline in many denominations, and people in the first tradition became bored with simple worship, the second theory of worship - that the church could decide to add whatever it deemed appropriate - began to win out. The older "Puritan" denoms began to look more and more Episcopalian in their worship and every denom generally began importing choirs and soloists and anything that it was felt would make the worship more engaging.
Gradually the formula that the preferences of the congregation should determine the structure of the worship became the norm. The singing and the hymns reflected the singing style of the culture of their time. The assumption therefore became that the preferences of the older generation and their "good ole hymns" was good and holy and normal. No one could remember a time when they hadn't worshipped and sung like that.
Unfortunately for them, a younger generation with a different culture which found their hymns and tunes dusty and boring was growing up in the church. Matters came to a head in the 1970s and gradually congregations began to bring in music that reflected the preferences of the new culture. The pace of this accelerated in the 1980s till in many churches the reigning tradition was now to sing modern (or contemporary) praise songs. For many people brought up on the earlier tradition, these new bland and repetetive songs that reflect the easy listening pop culture of the 80s are irritating, meaningless, and irreverent. The problem though is that having nailed your flag to the mast of preference, you are inevitably bound to the idea that whatever a majority (or the leadership) in the church prefer, will be the reigning paradigm.
So, the music you were forced to endure the other day is just a reflection of the
"have it your way" consumer culture. Most people think of the church as a consumer driven organization, so as Maverick essentially put it, they believe you shop around till you find the one that fits your tastes best - or you work to force the one you are in to conform to your desires.
To my mind this is all wrong-headed and will inevitably have disastrous consequences. I firmly believe that if we really are there to worship God, then His preferences as expressed in His word should determine the content of our worship. It shouldn't be my preferences or anyone else's that fix our worship "style."
Anyway, I don't know if you'll be interested, but I preached on the theory of biblical simplicity in worship and addressed some of the contemporary worship theory a while back. The audio of the sermon is here:
The Second Commandment The PDF file is located here:
Second commandment PDF - SEAGOON