An intriguing possibility. For those who might be unaware of the problems that have been caused by song licensing, two famous examples are the anime "Childs Toy", which had a very distinctive opening theme in the first season that was used as incidental music during the show. Due to an issue with the musician involved, in the US release, the relevant scenes had the soundtrack replaced with... silence.
A similar thing happened to the US release of "Gundam Zeta", whose distinctive opening theme was replaced by an orchestral arrangement. Both replacements caused some anger among fans, as they were not announced until shortly before the anime were released internationally.
"The power of bakers, the power of artists; even the power of witches! It must be a power given by God... sometimes we suffer for it."- Ursula, Kikis Delivery Service.