The song is called Tala Al Badru Alayna:
O the white moon rose over us ,from the valley of Wada.And we owe it to show gratefulness, where the call is to Allah.
O you who were raised amongst us,coming with a word to be obeyed. You have brought to the city nobleness. Welcome! best caller to God's way.
Tala'ul Badru 'Alayna, Min thaniyatil wada Wajabal shukru alayna, Ma da'ali lahi da
Ayuhal mab'uthu fina, ji'ta bil amri muta, Ji'ta sharaftal madinah, Marhaban ya khayra da
Heres the song by Yusuf Islam: