Yep! It’s a song in the movie “Arai 305′il Kadavul” – Aavaram Poovukkum sung by the beautiful Shreya Goshal.
Its a melodious folk love song. A catchy tune with a bad start ( a heavy folkore beats for 10 seconds). But dwindles down in to a great sweet melody. If someone is interested, I have writtent the lyrics below and attached the download link.

http://www.mp3nmore.org/songs/tamil/Arai-en-305il-Kadavul/Avaavaram-Poovukkum.php

Chorus
Aavaram poovukkum ayyanar tholzhukkum kadhal irukkudhaiya kadhal irukkudhaiya
Andha saamiyin kannathil sandhanam poosida kaigal thudikkudhaiya ayya kaigal thudikkudhaiya

Patta pagalula paadam nadakkuthu, aasai mazhaiyila aada ninaiyuthu ayya re ayya re manam thaiyya re thaiyya re.

Chorus

Verse1:
Aaachu vellatha pola thithhikkum aala kandathunala aasaiyil ullam unnal uucchi kottudhaiya
vatti kadhalin vatti kangala katti poduthu kutti nee vandhu enna meetu povaya
Maavattum kalla pola mavarasi kannu rendum maachana vattam podudhaiya ayya ayya
Seva kozhi konda pola seemati kannam rendum sekka chevappagi pochudhaiya
kadankari ponnukku kaimaru senjaven kayya pudikkanum yaaaa
ayyare ayyare manam thaiyyare (2)

Verse2:
thatthi thavuthu thitthi pombala bhuthi paithiyam muthi ponathu kanna enna maayam seidhayo
thaana vandhaven thaana thihthikkum ennam thandhaven thaana senjiduvano illa thavikka vaippana
kamatchi koil munna karagata sami pola kai veesi manasu suthudhaiya ayya ayya
mundhana kadhavukkulla munnooru kanavirukku mothama allikkollaiya
sithira maasathu kathiri veyilla kanna uruthiriye yeeeee

ayyare ayyare manam thaiyare thaiyare(2)

CIAO.