Insert the music CD that contains the song(s) you want to put onto your blank CD.
Open Windows Media Player. Click the "Rip" tab to open your CD's track list. Uncheck any songs you do not want to copy onto your new CD.
Click "Rip" to begin the copying process. Remove the CD from your computer when it's finished ripping, and insert the next music CD. Repeat Steps 1 through 3 with each new music CD.
Click "Media Library" located on the left-hand side of the window. Select the tracks you've ripped for burning by right-clicking each one (or highlighting all of them by holding down CTRL while clicking them) and selecting "Copy to CD or Device."
Make sure all the songs in your "Copy to CD or Device" list are check-marked. Insert a blank CD into your computer's CD-ROM drive. Click the "Copy" button in the upper right-hand corner of the window and watch the progress bar fill up as your new mixed CD is being created.
Insert the music CD that contains the song(s) you want to put onto your blank CD.
Open your iTunes software. Allow iTunes to import all the songs from your CD if you want. If you just want a few songs from your CD, you can click "Cancel" when iTunes asks you to add all songs into its library.
Uncheck the songs you don't want to burn onto your new CD. Click "File" and then "Add Folder to Library" to begin ripping your songs into the iTunes library.
Click "File" and then "New Playlist." Name the playlist whatever you like. Double-click the "Music" icon underneath the "Library" column on the left-hand side of the iTunes window to open up all the songs you've bought or ripped using iTunes.
Click and drag the songs from the library window, down onto the playlist you created. Double-click your playlist to open it. Make sure all the songs are checked, and then click "Burn Disc" in the lower right-hand corner of the iTunes window.