V.V.V.V.V. said:
Ugh I HATE track by track reviews now. They ruin all the surprise. A good review should:
1. Inform. Give a bit of background on the band (label, style, history, etc.) and establish why they should be checked out/avoided.
2. Persuade. Use a lot of objective words to describe the music, but lean towards making the reader want to believe your perspective. I'm not saying to slander the band, merely present a strong, unmoving opinion on the piece of work. If you flake out and can't make a stand, don't review it at all.
3. Conclude. Draw parallels to other bands of a similar style so that even if the review presents the band in a negative light, the reader may be reassured that there are either other bands doing it better, or that, if the reader like the band, you (the reviewer) attempted honestly to enjoy it but ultimately failed due to reasons mentioned. If the review is negative, perhaps make sure the reader knows that there may be other opinion on it and that yours isn't the only one. End your review with a sincere, concise summary.