Does Song Sleuth Work?
Yes. When used to its full potential the app will correctly identify sounds of the covered species with a high degree of accuracy. The fully automatic suggestions that pop up as soon as a recording is ended often include the correct answer, but the best results come if you take just a few seconds to highlight the target sound in the recording using filtering and trimming.
Your results will improve as you gain experience with the best ways you can assist the app, and you will be learning about bird songs at every step of the process. Some species are harder for the app to identify, and some individuals of every species are problematic. In these cases accuracy should improve as more data is added to future versions of the app.