YouTube is joining the army of sites offering music downloads. “If you like the song, you don’t need to leave Google or leave the site to buy it,” a rep from YouTube says of the new plan that will link music videos and songs played on YouTube with purchasing options via iTunes and Amazon’s MP3 store. Icons will appear during the uploaded video prompting users to where to purchase the song they’re listening to. Thus far, only videos for music from Universal and EMI will feature the purchase icons. YouTube also plans to add a similar feature linking users to concert ticket purchase options.