How do ii put music into another login name?

Hello, ii am wodering how do ii put songs into another login name like wen u turn on ur computer and it ask you witch one would you like to login and u pu tin ur passwrd that is if yue have 1 and ii downloaded some songs to the guest one and now it has stop working and now ii dnt want to redownload them again is there and faster or easy way to transphere them???? pleaze respond quickly...????