However, “gladwhatl” doesn’t correspond to any known term, software, or platform related to 80s/90s cartoon theme songs or MP3 downloads. It may be a typo or a keyboard smash.
Below I’ll produce a detailed academic-style paper on the actual subject suggested by the rest of your title: Sigle Cartoni Animati Anni 80 90 Da Scaricare Mp3 gladwhatl