It's hard to define what a perfect song is, because it all comes down to personal opinion.

For me a perfect song is where all the instruments you're using; vocals, guitar, bass, drums etc. all stand out and have an important part in the music.

Lyrics-wise, I find it's always good when song's have an actual meaning, it makes them that much more enjoyable to listen to.

And make sure the song doesn't get too repetitive, try to make it interesting from start to finish.

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~emkay
[KousouGames]
[last.fm]