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It's good. Now, after listening the song a couple of times and there are some minor things that could be fixed. -Univoicing is good for solo songs indeed, but what makes the lyrical part interesting is the variation in the rythm, for example holding the note a little longer to give it a little more of variation, thereby keeping the listener interested for longer period of time. Let's make a little analysis of "Sparks" by Coldplay to make this a little clear. You can see it is mostly harmony with a I-V-VII-IV chord progression with a simple beat which is SwMw rythm. Let's focus on the lyrical part, so you see what I mean. You can hear that the vocalist varied the rythm of the lyrics in order to make them more insteresting, holding them for longer or shorter periods of time, louder or shorter. for example, the part: "...My he-art is you-rs, 'ts you that I ho--ld on to..." (I use the "-" to express that the note is held, which is approximately a dotted 8th or a quarter note). Holding and This holding and variation of note lengths give life to the lyrical part of the song, of course, this could be skipped, but that'd make the song very very dull and only "beat-dependant". Going back to the topic, I think you should vary the note lengths strategically so that it brings life to the song.