Bauer Media Group would be the best media institution to distribute the author's pop music magazine for three key reasons:
1) Bauer Media Group has extensive experience in distributing magazines over many years and the author's magazine would benefit from their recognition and popularity.
2) The author's magazine would be the only pop music magazine distributed by Bauer Media Group, facing no direct competition from other similar magazines within the same institution.
3) Bauer Media Group also distributes several pop music radio stations, linking their offerings to the genre of the author's proposed magazine.