Properly speaking, what you are about to hear is not a “song.” 
It is called in Arabic أُنشُــــــــودة (or نشيـــــــــد, when a bit longer) and can be translated as “hymn” or “religious song”

This post’s unshuda is quite beautifully sung.
It can be appreciated by Muslims and non-Muslims alike; native Arabic speakers, new Arabic learners, and even those who don’t speak a word of Arabic!

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http://www.youtube.com/watch?v=e5NfCd-Dqvk

 « آمنــــــــتٌ بالله » (“I Believe in God”)

* * *

آمنــــــتُ بالله وملائكتــــــــــــــــــه

I believe in God and His angels

وكتبـــــه ورسلــــــــــه واليوم الآخـــــــر

And His book, His Messengers, and the Final Day

والقـــــدرِ خيـــــــــره وشـــــــرِّه من الله

And destiny, good and bad, both from God

والبعـــــــــــثِ بعـد الموت، لا إلــــــه إلا الله

And Resurrection after death; there is no god but God

آمنــــــتُ بالله وملائكتــــــــــــــــــه

I believe in God and His angels

وكتبـــــه ورسلــــــــــه واليوم الآخـــــــر

And His book, His Messengers, and the Final Day

والقـــــدرِ خيـــــــــره وشـــــــرِّه من الله

And destiny, good and bad, both from God

والبعـــــــــــثِ بعـد الموت، لا إلــــــه إلا الله

And resurrection after death; there is no god but God

 لا إلــــــه إلا الله،  لا إلــــــه إلا الله

There is no god but God, there is no god but God

 لا إلــــــه إلا الله، مُحمَّــــــــد رَسُـــــــــولُ الله

 There is no god but God, Mohamed is His prophet

 لا إلــــــه إلا الله،  لا إلــــــه إلا الله

There is no god but God, there is no god but God

 لا إلــــــه إلا الله، مُحمَّــــــــد رَسُـــــــــولُ الله

 There is no god but God, Mohamed is His prophet

اللَّــــــــــــهُم

O Lord

اللَّــــــــــــهُم

O Lord

(In English) 

 Faith is belief in Allah and the Messengers

The angels and the Final Day, and the holy scriptures

And to believe in destiny

That good and bad both come from Him

And the Resurrection; there is no god but Allah

(In Arabic)

لا إلــــــه إلا الله،  لا إلــــــه إلا الله

There is no god but God, there is no god but God

 لا إلــــــه إلا الله، مُحمَّــــــــد رَسُـــــــــولُ الله

 There is no god but God, Mohamed is His prophet

لا إلــــــه إلا الله،  لا إلــــــه إلا الله

There is no god but God, there is no god but God

 لا إلــــــه إلا الله، مُحمَّــــــــد رَسُـــــــــولُ الله

 There is no god but God, Mohamed is His prophet

اللَّــــــــــــهُم

O Lord

اللَّــــــــــــهُم

O Lord

(In English)

Allah is the creator of heaven and of earth

Nothing may compare with Him

He is the One alone

The Prophets, best of humankind

Sent to all nations and all tribes

Last of all Muhammad, mercy to the worlds

(In Arabic)

لا إلــــــه إلا الله،  لا إلــــــه إلا الله

There is no god but God, there is no god but God

 لا إلــــــه إلا الله، مُحمَّــــــــد رَسُـــــــــولُ الله

 There is no god but God, Mohamed is His prophet

لا إلــــــه إلا الله،  لا إلــــــه إلا الله

There is no god but God, there is no god but God

 لا إلــــــه إلا الله، مُحمَّــــــــد رَسُـــــــــولُ الله

 There is no god but God, Mohamed is His prophet

اللَّــــــــــــهُم

O Lord

اللَّــــــــــــهُم

O Lord

(In English)

Formed of light and beauty, the angels of the Lord

To praise Allah, to help mankind, Jibril [the Angel Gabriel] brings the word

The scriptures, all by Allah sent

Torah, Psalms and Gospel, then

The source of perfect guidance, the Glorious Quran

(In Arabic)

لا إلــــــه إلا الله،  لا إلــــــه إلا الله

There is no god but God, there is no god but God

 لا إلــــــه إلا الله، مُحمَّــــــــد رَسُـــــــــولُ الله

 There is no god but God, Mohamed is His prophet

لا إلــــــه إلا الله،  لا إلــــــه إلا الله

There is no god but God, there is no god but God

 لا إلــــــه إلا الله، مُحمَّــــــــد رَسُـــــــــولُ الله

 There is no god but God, Mohamed is His prophet

اللَّــــــــــــهُم

O Lord

اللَّــــــــــــهُم

O Lord

(In English)

The reckoning, the Final Day, when all will see their works

Remade in soul and body to stand before the Lord

With patience bearing every grief

With thankfulness for all blessings

We are content with destiny, the Will of Allah

Faith is belief in Allah and the Messengers

The angels and the Final Day, and the holy scriptures

And to believe in destiny

That good and bad both come from Him

And the Resurrection; there is no god but Allah

(In Arabic)

آمنــــــتُ بالله وملائكتــــــــــــــــــه

I believe in God and His angels

وكتبـــــه ورسلــــــــــه واليوم الآخـــــــر

And His book, His messengers, and the Final Day

والقـــــدرِ خيـــــــــره وشـــــــرِّه من الله

And destiny, good and bad, both from God

والبعـــــــــــثِ بعـد الموت، لا إلــــــه إلا الله

And Resurrection after death; there is no god but God

 لا إلــــــه إلا الله،  لا إلــــــه إلا الله

There is no god but God, there is no god but God

 لا إلــــــه إلا الله، مُحمَّــــــــد رَسُـــــــــولُ الله

 There is no god but God, Mohamed is His prophet

 لا إلــــــه إلا الله،  لا إلــــــه إلا الله

There is no god but God, there is no god but God

 لا إلــــــه إلا الله، مُحمَّــــــــد رَسُـــــــــولُ الله

 There is no god but God, Mohamed is His prophet