Dihydroergotamine is used to treat migraine headaches and cluster headaches. It is not recommended for migraines that affect only one side of the brain (hemiplegic migraine) or the base of the brain /neck area (basilar migraine), or to prevent migraines from occurring.
Pop music is an abbreviation for popular music. In other words, the main difference between pop music and alternative or underground music is the kind of following it has: pop music is usually known by a lot of people and regularly appears on TV.
Indie pop is a music genre and subculture that combines guitar pop with DIY ethic in opposition to the style and tone of mainstream pop music. It originated from British post-punk in the late 1970s and subsequently generated a thriving fanzine, label, and club and gig circuit. Compared to its counterpart, indie rock, the genre is more melodic, less abrasive, and relatively angst-free. In later years, the definition of indie pop has bifurcated to also mean bands from unrelated DIY scenes/movement