Is it permissible to listen to soothing/beautiful recitations of the Holy Quraan while working? Because I have heard that if you listen to the recitation of the Quraan it’s better to give it your undivided attention rather than listening to it but not reflecting on its meaning.

Yes one should benefit from the Qur’an and listen to it attentively, but it’s ok to listen to it for soothing purposes. That’s fine, as long as it’s not considered disrespectful to the Qur’an