Well, sinking music from iTunes in some way could be the same as adding music to the folder of a music player; since, if you add music manually to iTunes, you will do exactly the same thing. You will need to click add file or something like that in the case of iTunes, and you will click add file for an installed app. Anyway, I like VLC for iOS. I woould recommend it.

Okay Thanks, I'll try vlc.

@5:
Oh wow. Was told that foobar on ios is inaccessible, but wanted to make sure regardless. Thanks for that. So far the app has worked seamlessly for me both on pc and on droid, but I do plan to get an iphone soonish. Will probably go for vlc too, in that case.

Could you tell me the process of adding musics on vlc media?

VLC for iOS is badass! There are tons of ways to import content, including the web browser method discussed above and via SMB network shares.

The Files app in iOS 13 or later can also import content from SMB shares, though last I tried this, I couldn't figure out how to copy the files to the local storage on the device. Safari in iOS 13 or later also allows you to download any file from the Internet, so this is another way to obtain content if you wish.

Finally, you can use Apple's Lightning to USB 3 Camera Adapter to connect flash drives and SSDs to your phone. This requires iOS 13 or later, and at least on my iPhone 6s, you have to connect the adapter to a power source using a Lightning cable to provide enough power to the USB device. I don't know if newer phones provide more power, and it doesn't seem to work on portable mechanical hard drives. My suspicion is that these simply require more power than the adapter can supply, even when connected to an independent power source. You'll most likely need to get a desktop hard drive that has its own power supply in order to use these with iOS.

@Defender: You're very much welcome. Yeah I also got extremely excited then I noticed the web browser feature. It's interesting that people don't talk much about how powerful VLC is on IOS. I can't speak for Android though, but I think that's the same.