Solving the problem

triforce.js

                          // Let's reduce the array of arrays into a single one
const songNames = allSongs.reduce((acc, currValue) => {
                            return acc.concat(currValue);
                          }, [])
                          // Let's map it out with the seconds turned into minutes 
                          .map(song => {
                            return { ...song, duration: Math.floor(song.duration / 60) };
                          })
                          // Let's filter the ones under 3 minutes
                          .filter(song => {
                            return song.duration > 3;
                          })
                          // Now let's map out the song names the quick way
                          .map(song => song.name).join(" , ");

console.log(songNames); // Oblivion , Flying Whales , L'Enfant Sauvage , Out of the Black