Question

You listened to a song on your computer. Did you use hardware or software? Explain.

Answer 1

Software, unless you permanently downloaded the album or song to your computer's hard drive.

Answer 2

Software, unless you planned on permanently downloading the Music Album or Song to your computer's Hard Drive. i.e, you would use whatever Music or Media player you have installed on your computer, and that simply counts as Software. 
 hope this helps.