Not talking about the performance, but the work. When you said "It's just as trustworthy as Bach's symphonies" it implies his composition, not its execution, such as the New York Philharmonic or the Patrick Henry Jr. High school band might play it. Had it's execution been in mind, a literate person would phrase it as " trustworthy as the performance of Bach's symphonies"; the performance being the paramount object of trust.
And an intelligent person would remember what he is arguing.
There is no composition of the Bible, as we've already established. All we have is performance, so I am comparing apples and apples, at least inasmuch as it's possible to trust Scripture, music, and art. All we have is the experience - we have no inerrant text, and indeed the texts that we have, this artificial thing that you call 'the Bible' is an arbitrary translation of a collection of text. If we are going to trust it, we must trust it as it is and not as we would like it to be (in your case, a straw man).
So the argument cannot possibly be that we can only trust an inerrant Bible, because an inerrant Bible doesn't exist (and never has).
However, the Bible is trustworthy for what it is -- for what it can possibly offer us -- in the same way that we can trust other imperfect media (like music and art) that enrich the human experience.
In fact, there is nothing - or very, very little - in the human experience that is inerrant. Perhaps mathematics and physics can get us as close as possible to perfection (only for a short time) - but everything else is subject to continual development and change.