From Wikipedia:

This frenzy first occurred in Berlin in 1841 and the term was later coined by Heinrich Heine in a feuilleton he wrote on April 25, 1844, discussing the 1844 Parisian concert season. Lisztomania was characterized by intense levels of hysteria demonstrated by fans, akin to the treatment of celebrity musicians today – but in a time not known for such musical excitement.

And:

Musicologist Dana Gooley argues that Heine’s use of the term “Lisztomania” was not used in the same way that “Beatlemania” was used to describe the intense emotion generated towards The Beatles in the 20th century. Instead, Lisztomania had much more of a medical emphasis because the term “mania” was a much stronger term in the 1840s, whereas in the 20th century “mania” could refer to something as mild as a new fashion craze. Lisztomania was considered by some a genuine contagious medical condition and critics recommended measures to immunize the public.