他唱的歌是一首反戰的公益歌曲〈Tell me why〉。
歌詞以孩童的角度來觀看世界，藉由孩童好奇心旺盛的特點，不斷地對地球上的我們所作的一切提出疑問，隨著愈加高漲的情緒，一步步質問甚而反問自身「生而為人應該做些什麼（what will I have to do to be a man ）」。
這樣的歌曲藉由一個十歲的小男孩Declan Galbraith來詮釋，感覺更加貼切，也讓人有更深的體悟與沉重的無奈。
Tell me why sing by Declan Galbraith
Lyrics：
In my dream
children sing
a song of love for every boy and girl
The sky is blue and fields are green
and laughter is the language of the world
Than I wake and all I see is a world full of people in need
[Chorus]
Tell me why(why)
does it have to be like this?
Tell me why(why)
is there something I have missed?
Tell me why(why)
cos' I don't understand
when so many need somebody
we don't give a helping hand
Tell me why?
Every day
I ask myself
what will I have to do to be a man
Do I have to stand and fight,
to prove to everybody who I am?
Is that what my life is far
to waste in a world full of war?
[Chorus]
Tell me why(why)
does it have to be like this?
Tell me why(why)
is there something I have missed?
Tell me why(why)
'cos I don't understand
when so many need somebody
we don't give a helping hand
Tell me why (Tell me why)?
Tell me why (Tell me why)?
Tell me why (Tell me why)?
Just tell me why!
[Chorus]
Tell me why(why),
does it have to be like this?
Tell me why(why)
is there something I have missed
Tell me why(why)
'cos I don't understand,
when so many need somebody,
we don't give a helping hand.
Tell me why?
(Why,why,does the tiger run)
Tell me why?
(Why,why,do we shoot the gun)
Tell me why?
(Why,why,do we never learn)
Can someone tell us why we let the forest burn?
(Why,why,do we say we care)
Tell me why?
(Why,why,do we stand and stare)
Tell me why?
(Why,why,do the dolphins cry)
Can someone tell us why we let the ocean die?
(Why,why,if we're all the same)
Tell me why?
(why,why do we pass the blame)
Tell me why?
(Why,why,does it never end)
Can someone tell us why we cannot just be friends?
Why,why,(do we close our eyes)
Why,why,(do the greedy life)
Why,why,(do we fight for land)
Can someone tell us why 'cos we don't understand?
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