How to transfer my Itunes to a new computer?

I used to have a desktop with all my Itunes and now I no longer have that desktop at all there's no way I can get it back I have a new computer now

and all my music is on my Iphone and I want to add my songs to my computer how can I do this I don't want to erase all the music because then I have to re download 400 plus songs

Added (1). But I don't have the old computer anymore

its all on my Iphone how can I use a flash drive for that

Download itunes to your new computer

take a flash drive and transfer them over

Take your iPhone, plug it into your new computer, log into your iTunes account, transfer purchases, and SHOVE IT UP YOUR BUT! HA! Just kidding, but the stuff before was legitimate. Also, if you have access to your old desktop, you can either migrate it or put the songs on a flash drive.

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