Let the Music Do the Talking is the first of four albums by The Joe Perry Project. It was their the most successful, selling approximately 250,000 copies in the United States. The title track was re-recorded by Joe Perry's more successful band Aerosmith on their album "Done With Mirrors", albeit with a slightly different melody and Steven Tyler penned lyrics.
The Joe Perry Project released less than 5 albums.
It's definitely correct because they only released four albums as seen in the first sentence. It's difficult for the system because it seems to have trouble comparing two numbers when the phrases more than/less than are used, and the "first of four" might have been hard for it to analyze.