This might be a script problem... When I battle test the bgm music plays an imported song. When I play test the game and get into a battle, it plays the default Battle1 song in the battle. I can't figure out what it is. I tried Change Battle Music in an Autorun event at the beginning of the game but it still played the Battle1.
I'm completely done with this game except for this one problem. Can't publish it until this is resolved. Professional assistance is appreciated

Maybe you forgot to change the music for the battles, which is located in the Database (Press F9), System tab.

Was that the problem?

This above is a solution to your troubles of the game automatically playing battle1. To fix your problem with the event, set the event to parallel process instead not autorun.

Also there could be a problem with the song you are trying to have played. If the song isn't correctly made and fits in the criteria of rpgmaker vx it will not play. I had this problem once before. (This would be the fact of what file it is, as wma, mp3, or wav's.)

I don't think it's the file type because when I change it to a different default song, Battle4 for example, it still plays Battle1. the file type is mp3 for my song. no matter what I change it to in the database it still won't keep it in the game.

Try opening the script editor and press Ctrl+Shift+F , then type in "Battle1" or whatever the problem song is. If it comes up with anything, that's probably the problem.

I did the find thing. I searched music, bgm, and song. didn't work. Also, when I kept playing the game, the song changed when I played different monsters in a different map.

What scripts are you using that effect battles and your game audio? Since no one gets this problem by default, the problem is either

A. A script is causing this problem
B. Your project has become corrupt for some reason.
C. You aren't using the events right.

Sideview Battle System Version 2.6 (English Translation v1.3)-Tankentai
KGC_LargeParty
That's all the ones that effect the battle

I fixed it!
I had Yanfly Engine RD - Menu System Options script. When I scrolled through the script, I found I had another Yanfly script under it. I was so mad at it that I deleted it so I don't remember the name. It was something to do with Changing the Battle Music according to your character.
I shoulda searched battle1 like XZidDede said to...
Thanks for all your guys' support! It is greatly appreciated