With huge musical success come many great things; money, fame and the adulation of millions. However, being recognised on a huge scale can also bring you to the attention of less than savoury characters.
There is barely an A-List star in the world who has not had to endure a stalker at some point in their career with many bosating more restraining orders than hit singles.
Take Usher, below, who had to get a court to intervene between himself and Darshelle Jones earlier this year. The woman turned up at his home in Georgia and, when police arrived, told anyone who would listen that she and Usher were married.
We have compiled a list of ten of the most deranged and scary music stalkers below, take a look through the case studies now.
Albums to listen to when you need to unwind
London Grammar, Deap Vally, The 1975 and more bands you can't afford to miss this weekend
Electronic band continue Delta Machine tour
Stars talk about Usher's idols and finding Justin Bieber
Plus; Hudson Mohawk, Hurts, The Men, Valerie June and more new music