The visually and aurally striking horn was one of the most desired ever. Harley listed "Artpop" as one of the more aurally pleasurable tracks from the album. The fidelity of sound reproduction may be assessed aurally or using measurement equipment. Apparent source width is the aurally perceived extent of a sound source. SITOR has an aurally easy to identify idling pattern. A voice browser presents information aurally, using pre-recorded audio file playback or text-to-speech synthesis software. DAISY also provides aurally accessible tables, references, and additional information. Aurally it contrives to suggest something at once slippery and tortuous. Music was generally learned aurally and memorized by the musician(s) beforehand, then played without aid.