How Should I Pronounce the Character 說 In This Lyric?
Take a look at this video. This lady tried to use the pronunciation que to rhyme with other e or e endings. It's a lyric by 柳永. The second paragraph goes like this:

多情自古伤离别，更那堪，冷落清秋节！
今宵酒醒何处？杨柳岸，晓风残月。
此去经年，应是良辰好（或“美”）景虚设。
便纵有千种风情，更与何人说！


Note that it's not exactly "古音". She just sang in Mandarin and borrowed the 说 sound from somewhere else. I don't know where she borrowed it, but it's a bit strange. The rhyme seems to be working in modern 吴语, 粤语 and some other vernaculars, but none of them uses a plosive consonant. IMO if we read in Mandarin and try to rhyme, it's probably best to read it as xue4. 

Anyway, mandarin sucks when you try to read classical poems. We can use workarounds for vowels. As for the tones, there is nothing we could do..

词林正韵 is a good starter's book for rhymes in classical poems. It tells you what rhymes with what, but it doesn't tell you how they pronounce.