iOS devices in default  have no such features to access music or any files from anywhere without iTunes. I think it might be frustrating syncing only with one iTunes Library everytime with iTunes. But there’s a good news from jailbroken user, who wants to transfer music, photos & videos without using iTunes.
iOS devices in default  have no such features to access music or any
files from anywhere without iTunes. I think it might be frustrating syncing
only with one iTunes Library everytime with iTunes. But there’s a good news
from jailbroken user, who wants to transfer music, photos & videos without using iTunes.

There is a tweak called PwnTunes that will make you
easier and allows you to import & export music directly to your iPhone,
iPad or iPodTouch without iTunes. You can now use your iPhone as USB and can import
music, photos & videos, files from anywhere from any PC. No extra Software
is required.

After installing this tweak you have
an option to configure from Setting Panel.

How to use it.
First locate your device.

iOS devices in default  have no such features to access music or any files from anywhere without iTunes. I think it might be frustrating syncing only with one iTunes Library everytime with iTunes. But there’s a good news from jailbroken user, who wants to transfer music, photos & videos without using iTunes.

After successfully installation of
PwnTunes your iDevice file structure will change within the 
windows file
explorer.You will now have 5+ folders available.
You can simply drap & drop any
files according to their folder.
They will automatically add
themselves to the respective app.

PwnTunes  tweak is available in Cydia from the BigBoss Repo for $12.99 and is compatible with iOS 9. If your device has not yet jailbroken, then follow this step by step guide to How to jailbreak iOS 9.0.2 untethered by Pangu.