they where the main entrance on a temple of the king Amonhotom the 3rd 14 century BC but there this no temple now but they r sherching for it.........Due to an earthquake in 27 BC, these statues became known for a bell like tone that usually occurred in the morning due to rising temperatures and humidity. Thus they were equated by the early Greek travelers with the figure of Memnon, the son of Aurora who's mother, Eos, was the goddess of dawn. To be granted a song meant that you were very much in favor of the gods. Visitors came from miles around to hear the music, including Emperor Hadrian, in 130 A.D. The Roman emperor Septimius Severus, seeking to repair the statues in 199 AD, inadvertently silenced them forever.
2nd text from:http://www.touregypt.net/collmem.htm thx for view or commenting