Por una cabeza is just one step away from Perlman - a violinist who has played all classical violin masterpieces and even played the poignant theme music for the movie "Schindler's List". John Williams - a composer who has won five Academy Awards for Best Film Score. For the first time in their lives, two giants in the contemporary music world have joined forces to perform one series after another of gentle and moving famous film music on this album. The most famous one should be "Por Una Cabeza (Only One Step)" composed by Gardel, the uncrowned king of Argentine tango. This is a song that has been featured in "Schindler's List", "Scent of a Woman" and "True Lies". The famous tango dance that has appeared. This Tango-style song is in the form of ABAB. The first section presents a lazy and humorous tone. It enters the B section and changes to a minor key, then shows a passionate feeling, and then switches back to a major key. A performance of contrapuntal harmony by violin and harmonica. The inconsistent and well-proportioned styles of the two parts fully demonstrate the tacit understanding between the two in tango dancing. The passion after entering the B section pushed the emotions of the dancers and the audience to the highest point. Then suddenly slow down and return to the first tune to finish. The whole music is tactful and exciting under Perlman's superb performance, showing the refinement of tango dance music. After a song is finished, the melody lingers in the mind, like a dance that is not fully enjoyable, always just one step away, and always feeling lost. Listen to it, you will never miss it again.