Learn English – what does mean “By this point”

"By far and wide" is simply an inappropriate mixture of "by far" and "far and wide".

The speaker or writer has gaffed, or has picked up the usage from someone.

"By far" is used to express a degree to which something is superlative. If something is by far the best, it means that the distance between that thing and the second best one is conceptually far.

"Far and wide" is an common phrase which refers to a conceptual or physical two dimensional area (which has width and depth).

"The king looked far and wide for a bride".

"By far and wide the best" makes no sense, because comparisons are arranged on a conceptually linear scale, not a two dimensional scale.

I would recommend new learners of English not to use this: keep "by far" and "far and wide" separate.

To be on the square: to be completely honest in what you say and do

Square is often used in idioms that refer to correctness and straightforwardness. For example, you could get a square deal or you could say that something is squared away.

(By the way, music is a mass noun, so you can't say "a music". You have to just say "music" or "a song" or "lyrics".)