25 Irish Songs (WoO 152) were composed by Ludwig van Beethoven.
After Beethoven arranged the melodies Thomson added the lyrics.
His original choice to write the lyrics, the Irish poet Thomas Moore turned him down however.
[1] They were published in 1814 in A Select Collection of Original Irish Airs and later reissued in Thomson's Select Melodies of Scotland, Ireland and Wales.
Barry Cooper said of Beethoven's Irish folk song arrangements that they have ‘a kind of sophisticated artlessness that no ordinary composer could achieve’.