Acrostic, not quite, but I'm found in a similar manner in this riddle

Question

Since this is the first time I've had two puzzles not completely solved in a week, this puzzle was designed to be simpler.

Very important, are the lines that I write,
Certain words, they won't appear quite right.

Harmony accompanies me, to those who listen,
Poised elegantly, by those who have written.

Bibles and songs hold me within their pages,
I've appeared everywhere, throughout the ages.

What am I?

Answer 1

I think you must be

Verse

Very important, are the lines that I write,

A verse is a group of lines that form a unit in a poem or song

Certain words, they won't appear quite right.

Usually to fit a rhyme or structure, words need to be moved around.

Harmony accompanies me, to those who listen,

Verse writing is usually arranged in a metrical rhythm and usually ha a rhyme scheme which is favourable for musical arrangement.

Poised elegantly, by those who have written.

Verses are intentionally written with such structure.

Bibles and songs hold me within their pages,

Each of the short numbered divisions of a chapter in the Bible is a Bible verse, songs are often divided into verses

I've appeared everywhere, throughout the ages.

Writing in verse is quite common.

Additional hint

Taking the first letter of the first line, the second of the second line,... and the fifth of the fifth line spells out VERSE