How to get a song on your iPhone if it isn't in the iTunes Store?

So I wanted to buy Sunspot Baby by Bob Seger for my phone, but it isn't on the iTunes Store. Where can I download it? I really don't want to go and buy the CD and burn it into my computer, and all I have is the vinyl record of the album.

https://www.7digital.com/artist/bob-seger/release/live-on-air-bob-seger?h=06&partner=1093

You can buy it off another provider such as Amazon.

You need to first plug your phone into your computer with the cable. If you don't already have Itunes on your computer, download it before doing these steps on this website: http://www.apple.com/.../download/ Download the song from Youtube with this link: http://www.youtube-mp3.org/
Once you converted it, Download it.
From your downloads folder, right click the song.
Once you click it options will pop up, click "Open With…" then click "Itunes".
The song will pop up in Itunes and you can add artwork and change the title by right clicking and in the options click "Get Info", If not, just drag the song to the small IPhone in the corner and then drop it onto the bar on the left sid showing the option "_____'s IPhone" Then it will sync to your IPhone then you are done!