The famous bass riff (G – B – C – D – Eb – D – C – B) must not be played legato. Listen to Piazzolla’s 1974 recording with his Conjunto 9. The bass is marcato (punched) and rubato (slightly pushing and pulling against the drummer’s beat). Aim for a metallic, percussive tone.

. Published in 1974 during Piazzolla's time in Milan, it served as his official manifesto for Tango Nuevo