Up the Downstair (1993) was the first proper Porcupine Tree album (OTSOL being a compilation of early tape recordings), with guest musicians that would become full-time PT band members.
On a personal note, Synesthesia was the very first PT song I ever heard, so this album holds some significance for me.
As with the other albums, Top 2 will go to Finals, 3rd to Consolation.
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24 hours to vote.