From MP3::Tag POD:
autoinfo() returns an array with the information or a hashref. The hash has four keys 'title', 'track', 'artist' and 'album' where the information is stored. If comment, year or genre are found, the hash will have keys 'comment' and/or 'year' and/or 'genre' too.

Try: 

my $info = $mp3->autoinfo();  # hashref
print $info->{album};
print $info->{artist};

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See also:

In reply to Re: Get certain information from MP3::Tag's autoinfo() by toolic
in thread Get certain information from MP3::Tag's autoinfo() by thmsdrew

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