MashupMaker

MashupMaker splits each upload into four stems, keeps the vocal from the song you choose and the drums, bass and other parts from the second, then time-stretches and pitch-shifts the vocal to fit. Preview, adjust levels and vocal start in the mix editor, and download a 192 kbps MP3. Pairs that are too far apart in tempo or key are declined before any charge. New accounts get 1 free mashup with songs up to 60 seconds. Pricing: Freemium.