If you really like a song by an artist, but don't feel like downloading the entire album it appears on, you'll need to know how to download and buy a single song. Digital music services like Amazon MP3 and iTunes allow users to download single songs over the Internet with just a few mouse clicks. Those sites do require you to sign up for an account and a credit card number is needed to make any downloads.
Enter the title of the song you want to download in the search bar of the service.
Click on the album title of the song on which the single song appears.
Click on the "Purchase" or "Buy" button next to the song you want to download.
Sign in to your account at the service by entering your email address and password and confirm your purchase if you are prompted to.
Your card will be charged as soon as your approve the download, which usually takes under a minute.
If you like several songs on the same album, it may be cheaper to buy the entire album. For example, on iTunes as of 2010, individual older songs cost 99 cents each. The same songs might be among 10 songs on an album that cost just under $8.50.