When you download songs from iTunes, all songs cost 70p-99p depending on how popular the song is.
How Much Does It Cost To Download Songs To The Ipod Touch?
You can download your music CDs to iTunes and then those tunes to your ipod, thus costing you nothing. If you trust these sites on the internet, there are a lot of them that you download tunes for free,eg, www.kazaa.com, wwww.limewire.com and many others. Make sure you have a good antiviral program if you do this.