I need to transfer music from my husband's Itunes to my Iphone?

Basically, my husband is out of town and took my laptop with him, since he only has a desktop. We each have individual Itunes libraries on our computers because we have very different taste in music. However, I have ripped some new music off a CD onto his Itunes to listen to while he is gone. Unfortunately, his Itunes won't allow me to add these songs to my Iphone without syncing, and thus erasing all of my music. I thought it would work because our 2 computers are on homeshare, but I guess since my laptop is hundreds of miles away it won't work? It is the same Itunes account, just different libraries. Anyhow, I just want to add this new music without having to download a lot of software and without losing the files I already have on my phone. Is this possible?

Note:
My phone is an Iphone 4.
His Itunes is completely up to date.

You should be able to add music to the phone from the cloud with his apple ID (I assume he purchased the music with a separate ID and password).

Sign in to his apple ID on your phone.
Go to "purchases".
Select any music you want to add to your device by clicking the cloud icon to download.

If you have only one ID and password, you can skip the sign in and out, and just download purchased music from the cloud.

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