How do i hear my downloaded music?

I downloaded my music from Youtube-mp3 converter and i don't know how to listen it on my iphone 4s. On a answer, it said i had to transfer it to itunes. How do i do tht?

If you downloaded them directly on your phone you should have an app that reads files on your device. Like a file explorer to see where you downloaded them to. If it helps try downloading them on you PC and then sync them to your phone through iTunes so that you can listen to the MP3 on the music app that already comes with your phone.

Drag and drop the downloaded song onto your itunes playlist.

Follow the instructions below and then sync the music to your iphone.

iTunes helps you add digital audio and video files on your computer directly to your iTunes library. You can add audio files that are in AAC, MP3, WAV, AIFF, Apple Lossless, or Audible.com (.aa) format. If you have unprotected WMA content, iTunes for Windows can convert these files to one of these formats. You can also add video content in QuickTime or MPEG-4 format to iTunes. To learn how to add these files to iTunes follow the steps below.

Open iTunes
From the File menu, choose one of the following choices:
Mac
Add to Library
Windows
Add File to Library
Add Folder to Library
Navigate to and select the file or folder that you want to add
If iTunes is set to "Copy files to the iTunes Music folder when adding to library," iTunes will copy all content that is added to the iTunes library to the iTunes Music folder. To adjust this setting or change the location of this folder, go to the Advanced tab in iTunes Preferences.

To get the files into your iTunes library, open iTunes, go to your library (if you aren't there already), and press ctrl+O (command+O on Mac). Find the files and click open.