The term a capella singing is identified in base64 scheme by the sequence YSBjYXBlbGxhIHNpbmdpbmc=, while the MD5 signature is equal to a17e87dd0f35d3879be74555d08eedac. The ASCII encoding of a capella singing in hexadecimal notation is 6120636170656c6c612073696e67696e67.