SCALES-TO-BACKTRACK GUIDE | Think of an Instrument. Any instrument. Now play. Violin, Viola, Cello, Double Bass, Piano, Organ, Harp, Saxophone, Trumpet, Trombone, Guitar, Flute, Clarinet, Oboe, French Horn, the Voice and many more. Backtracks that’ll rock your fingers. AIRscales provides you with a Guide Track to your Backtrack PLUS a Solo Backtrack. Two different tempos, three different styles and one to four octaves to choose from. At AIR, we ensure that the individual needs of the serious musician are always met. No instrument is too brassy or too tame to be played and enjoyed with AIRscales.