iTunes in the Cloud

[josh44#AC]

Okay, this may be a common and easy question but I cannot find an answer. I have songs in my iTunes library that I had imported at one time or another. I want to put some of those songs in the cloud so I can download them to my phone when I want. For some reason there are already some songs in the cloud that I have downloaded to my phone but I do not know how they got there. I did not purchase them, they were imported from a while ago, well before iCloud. Thanks in advance!