How can I completely delete the music on my iPhone 5s?

Question

For some reason I have not been able to manage the music on my iPhone 5s (running iOS 8.3). Even when I turn off iTunes Match and turn it back on, songs (and more importantly artists) that I have deleted from my desktop (iMac running OS X 10.10.3) and iCloud come back. I have done a complete restart on my phone and tried to manually manage what is on my phone in iTunes but I still can't delete the songs/artists. The reason for doing this in the first place was to make more room on my phone. A recent trip left me needing more storage to take more pictures. As there were a lot of songs and artists on my phone that I really haven't listened to in a long time I decided that was a good option. Now when I get home from my trip and sync my phone on my desktop everything just goes back to the way it was. I attempted to remove the items in iTunes and still no change. I really can't tell if it's a problem with iTunes, my phone or my desktop. But when I deleted an artist and sent it to the trash and it still came back then I got a little scared and knew I needed some help. Basically at this point I would just like to delete all the music on my phone and make a fresh start. Thanks to everyone who reads this and can offer some guidance.
P.S.: I'm using iTunes version 12.1.2.27.

Answer 1

There are a few ways to do this!
Is your laptop the "new iTunes" linked to the iPhone4?
Lets presume so.
this only works with non-DRM files/ your personal music files.
Go to your desktop.
1. You need to find the iTunes Media folder that holds your music.
Method A : Using Spotlight : type "iTunes media"
Open this folder.
See "music" folder.
Double click on this and it will have all your old music.
Copy this folder onto a Flashdrive/external drive. (call the folder "Old Music")
Then disconnect the flashdrive from your desktop and take it over to your laptop.
Open the Finder and find your flashdrive with the Old Music folder.
OPen that folder (It should have all your old music!)
Selct all and drag and drop this onto iTunes!!
Sync your iPhone!
Method B to find the Media file with your old music.
Click Finder.
Under places you should have your user name.
Click on this
You should then have a series of folders : Applications/Desktop etc.
One of these will be Music.
Click or dble click! on this. Find iTunes. Double click again.
Find a folder called Music...and then follow steps above to copy to a flashdrive....
Please note if you have copyright files in your Old iTunes, you can use a program like senuti or podworks to rip your stuff to a folder and then transfer to your "new music"....a bit more confusing!
Good luck...Its your music....you should be able to do what you want with it!!!