Check out the video
In an interview on a Mexican channel, Metallica guitarist Kirk Hammett was invited to watch a series of cover songs made by different channels on YouTube, and rate them for their quality.
Hammett comments on videos by Rob Scallon, the band Beatallica, and Metallica's album for babies, giving them all five stars. The guitarist was also impressed by the video of the Indonesian boy Azry Tabika Pack, whose cover of "Nothing Else Matters" has already surpassed 2 million views on YouTube. Hammett gave the boy two five-star ratings.
See the video below (the interview, with Spanish subtitles, starts at 1 minute 40 seconds):
