Apple Music pulling albums

I join Apple Music because of the “Why pay for downloads when you can have the whole library for £9.99 a month”, but the thing that drives me mad is : you set up you library with your favourite songs and albums and then without notice they remove song and albums eg- Olivia Newton John - Physical, Bon Jovi - Slippery When Wet. I think they should notify you so that you at least have the option to buy it before it is pulled