Metric is a synth-heavy indie pop band whose singer is a lady. James Hetfield is the singer of Metallica. Their vocal stylings are very different, as you can imagine.
I say this in the spirit of truthfulness and not in the spirit of contrarianism, but I didn't find the Tex Avery cartoon very funny. All the gags are pretty old-fashioned (obviously), and to me they've been drained of their comedic power by having become cliched. But that's just me; I'm glad they still bring you joy!