Maybe you are referring to some of the sites that use Spotify's API, like https://musicstax.com/ or https://tunebat.com/? The problem is that these sites often display inaccurate data. Although I haven't delved deeply into the issue, at first glance, it seems that what they label as "loudness" corresponds to momentary or short-term loudness rather than integrated loudness. Moreover, they do not provide true peak... Source: 11 months ago

With websites like songbpm.com and tunebat.com, you can look up the bpm for almost any song, which is great for musicians and to people who are just curious, but how do they determine only one bpm to display for a song with tempo changes? They don’t even tell you if the song has tempo changes, or what the other tempos are. For example, Bohemian Rhapsody has tempo changes in it, but it has been determined as 144bpm... Source: 12 months ago

Https://tunebat.com/ does this. It’s made for DJs but it’s really good at recommending songs with a similar sound to the song you search. Source: about 1 year ago

I'll also use spotalike.com, and tunebat.com. Source: about 1 year ago

I want to search songs by bpm, key, genre etc. I'm aware of beatport.com but that only has EDM. There is also tunebat.com but it doesn't has the feature to search songs by genre. It would have been great if these websites allowed searching songs by language as well. Source: about 1 year ago

If you are to copy all files to a(n external) drive you can use an app like Duplicate Detective to find and manage duplicates. Source: almost 2 years ago