"As Long As There's A Sunday" is a heartfelt country song by Ernest Tubb that revolves around a father's love for his child, even though he may not be able to see them every day. The song emphasizes the importance of Sundays, as it is the day the father sets aside to visit his child. The lyrics express how circumstances have made it difficult for the father to be with his child regularly, but it doesn't diminish his love. The phrase "apple of your daddy's eye" highlights the special place the child holds in the father's heart. The father reassures his child that, despite not always being physically present, he loves and thinks about them constantly. He acknowledges that others may question his rights as a parent, but declares that as long as there's a Sunday, the child will always be his. Ernest Tubb expresses his hope that one day his child will understand the reasons behind his limited visits and appreciate the efforts he makes to see them. He encourages the child to be good, obey their mother, and conveys his regards to her. Overall, the song beautifully conveys the deep bond between a father and his child, showcasing the father's commitment to being there for his child as much as he can, with Sundays being the cherished day for their reunion.