Music Downloader and Player is a free application that allows you to download music using your iPhone. It can be used when your phone is connected to the internet via a WiFi network or mobile data plan.
Downloading Music Using MP3 Music Downloader
To begin the process, download Music Downloader and Player from the App Store and install it on your iPhone.
Launch the application. On the main screen of the app, you will be shown options to search for music, listen to music and download music. Simply follow the onscreen instructions as highlighted in the image below, by clicking on the downward arrow located beside songs in the downloads category.
For more download options, have a look at this article.