Put all my albums and music on my iphone but it was synced with another library?

I need to put all my albums and music on my iphone but it was synced with another library i transfered files from my iphone to my itunes which has put all my apps on my laptop so if i sync it now it will delete all my apps obviously but if i just drag them will they go back on?

Yes. And would you happen to know about jailbreaking iPhones or iPod's

An iPhone can be synced with only one iTunes account at a time.once you switched to a new iTunes account or a new computer. You have to authorize your iPhone to it at first, then you can upload music and video from the new iTunes to your iPhone. But this way will overwrite the original files on iPhone with the new iTunes. You may try this iPhone transfer, it can help you copy files from iPhone to computer for backup, you can also use it as an iTunes alternative to upload music and video. It will not erase your original iPhone files. It's safe and works pretty well for me.
http://ipod-iphone-ipad-trans.posterous.com/ipodiphoneipad-to-computer-transfer-review

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