Four comments
Táim In Arrears
From the album ‘Lá ag Ól Uisce’, by Tomás Ó Gealbháin, Caoimhín Ó Fearghail & Seán Ó Fearghail.
The sleeve notes say that this tune "is a version of the song ‘Táim in Arrears’ which Ciarán Ó Gealbháin brought to my attention. It is to be found in the old song-book ‘Amhrán na nGleann’, edited by Finghin na Leamhna in 1939".
Here is a setting in G
I learned this from Tim Collins in a workshop in Florida around 2008.
Is it the same tune?
The second is the one I’ve always knew by this name
http://pipers.ie/source/media/?searchTerm=%20arrears&pageSize=12&sPage=1&mediaId=22714
Do you think the first is really a setting of the same?
Molly Rua?
Sure seems to be the tune I’ve learned as Molly Rua or Red Molly