KB (kilobyte) is the smallest of the three. 1,000 KB is equal to 1 MB (megabyte). 1,000 MB is equal to 1 GB (gigabyte) Also, B (byte) which is the smallest one, 1,000 of them is equal, to one KB. Audios (Songs) are usually 3-8 MB (3,000-8,000 KB).