8 October

Earth's Angels of Darkness, Demons of Light, with both parts I [2011] and II [2012] considered together, is one of several double or triple L P epics that define the last few years of popular music, including:

The Flaming Lips - Embryonic. Developed and sequenced as both a double C D and L P, but more widely made available as a single C D, since the two halves fit on a single disc.

Oneida - Rated O. Both a triple C D and L P, so no surprises if listening to the L P version.

Excepter - Presidence. Two C D's, no L P version. If there had been, two of the tracks, 'Presidence' and 'Og', would have been split into two sides, as they're both around a half-hour long; in general, the album's a mess by their standards; the tracks collectively titled 'Teleportation', also totaling around a half hour, would've made for an excellent single L P; another L P could've consisted of 'The Open Well' on one side with 'Leng' and 'The Anti-Noah' on another. 

Joanna Newsom - Have One on Me. Triple C D and L P, same set-up as Rated O--the C D's aren't long enough to cause sequencing problems for the L P's.

Kate Bush - 50 Words for Snow. Single C D, double L P; side A's too long and B's too short, but overall it's sequence of tracks works well in both formats.

Lou Reed/ Metallica - Lulu. Double C D and double L P; sequence works fine for both formats.

Swans - The Seer. Different sequence of tracks for the triple L P and the double C D. The Discogs entries give you the lowdown.

Scott Walker - Bish Bosch. Single C D and double L P. Sequence fits L P version perfectly.

Neil Young - Psychedelic Pill. Double C D and five-sided "sesquialbum" [see below], same sequence.

The Invisible Hands - The Invisible Hands. Double L P, the same songs by Alan Bishop, formerly of Sun City Girls, recorded twice with a Cairo-based band, once in English, once in Arabic. C D version only contains English-language versions.

The Knife - Shaking the Habitual. Double C D and triple L P, same sequence; the L P sides are awfully short--a good example of not ruining the sound quality of the L P with narrow grooves [see below].

Since the C D supplanted the cassette and L P around 1990, albums have generally been too long. A positive side effect, though, is that those artists who give more thought to issues of sequencing, and have understood the need to avoid unnecessarily-long albums, challenge themselves by making more double and triple L P's. Then again, artists realizing they have on their hands an album that works best being 50-60 minutes long can accept an impractical, but audiophile, solution: refuse to stretch the length of L P sides, instead putting out a short double L P or a 3-sided L P.

Some double L P's you may not have known were doubles, or certainly are not commonly referred to as doubles (in some cases with short sides or bonus tracks to make the sides not so short):
Sonic Youth - Dirty
Frank Black - Teenager of the Year
The Verve - A Northern Soul
Radiohead - O K Computer
The Flaming Lips - Soft Bulletin
Bob Dylan - "Love and Theft"
The Knife - Silent Shout
Panda Bear - Person Pitch
Animal Collective - Feels; Strawberry Jam; Merriweather Post Pavilion

Taking a broader historical perspective now, some 3-sided L P's (besides both of the Angels of Darkness, Demons of Light albums)--and no, this category doesn't include L P's with a bonus seven-inch, such as Pavement's Crooked Rain, Crooked Rain, or double L P's with such, like Stevie Wonder's Songs in the Key of Life):
Johnny Winter - Second Winter
Keith Jarrett - Eye of the Heart
Joe Jackson - Big World
Julian Cope - Jehovahkill
Thurston Moore - Psychic Hearts
Pavement - Wowee Zowee
Built to Spill - Perfect From Now On
Of Montreal - The Sunlandic Twins (third side referred to as an E P, but it is not: an E P would have the five tracks spread across two 45-R P M sides, instead of all five on a single 33-and-1/3-R P M side)

The Wikipedia section on sesquialbums notes the Norwegian band Motorpsycho, the true stars in this realm with two three-sided L P's and one five-sided. Besides Neil Young (noted above), The Mars Volta also have a five-sided album, Frances the Mute.