The "swara" differs slightly from the "shruti" concept in Indian music. Both the swara and the shruti are but the sounds of music. According to the music scholars of the distant past, the shruti is generally understood as a microtone besides veda and an ear. In the context of advanced music, a "shruti" is the smallest gradation of pitch that a human ear can detect and a singer or instrument can produce. There are 22 shruti or microtones in a saptaka of Indian music but Carnatic music assumes 24 shruti due to influence of 24 Hangaam of Arabic music. A "swara" is a selected pitch from 22 shrutis, using several of such swaras a musician constructs scales, melodies and "ragas". In the presence of a drone-sound of perfectly tuned Tanpuras, an ideal swara sounds sweet and appealing to human ear but particularly some 10 shrutis of the saptaka sound out of pitch (besuraa) when compared to the very drone. A tuneful and pleasing tone of the swar is located at a fixed interval but there is no fixed interval defined for two consecutive shrutis anywhere that can safely and scientifically be used throughout with respect to a perfect drone sound.