The trip hop is irrelevant -- my favourite Portishead album is actually Third, which largely left trip hop behind. And Beth Gibbons solo album from last year.
Mostly, it's a combination of interesting song structures, Beth Gibbons' vocals and lyrics. As Portishead evolved (and later as she went solo), it became more artistic and less poppy. And I like the later stuff more.
Here is a list of some songs that give me similar feelings that Portishead does. They are not exactly like Portishead, but IMHO definitely worth a try.
Massive Attack - Unfinished Sympathy,
Massive Attack - Teardrop,
Röyksopp & Alison Goldfrapp - Impossible,
Röyksopp - Vision One,
Saint Saviour - This Ain't No Hymn
Massive Attack is closer to Portishead, but they don't have female vocals on all of their songs. Röyksopp goes to a bit different direction but they have many songs with different female vocalists that might be something you like.
Might also try Zero 7. Their earlier albums feature vocals from Sia and Sophie Barker, as well as José González. All three have smooth evocative voices.
Sia: Destiny, This Fine Social Scene, The Pageant of the Bizarre, Speed Dial No. 2
Sophie Barker: Spinning, Passing By, In the Waiting Line, In Time
José González: Futures, Left Behind, Today, Crosses
These were all among my favorite songs almost two decades ago, when Trip Hop was at its height. Some I would still consider to be pinnacles of music.
If you’re in the mood for something not trip hop but with a similar vocal style you might enjoy Lamb - later stuff is probably most similar, earlier stuff is a bit more esoteric.
Morcheeba, definitely. Start with "Who can you trust?" and make your way through the discography. It evolves in style, but I think you'll find a few you'll like.
This list and massive attack pretty much covers what I would call close proximity (that I'm aware of). Of course there's a myriad of trip hop sub genres more or less close to this subset, but it can veer off quite far.
Adrian Younge! He makes hip-hop inspired jazz with legends from both genres and cites Portishead as one of his most beloved inspirations.
There's also Supreme Beings of Leisure, who were lesser known contemporaries of Portishead. Lots of similarities here, but they generally explore a wider breadth of feels besides depressive longing, and their sound definitely reflects that. One of my personal all-time favorite bands, these guys. Right up there with Portishead!
Edit: Mazzy Star also comes to mind for their shared tone. More of a stripped down sound in comparison, and they lean more toward bluesy folk, alt rock, and occasionally gaze than triphop, but their lyrics should have a familiar feel to Portishead fans. They might be a bit disimilar on the surface, but they share a lot of the same spirit once you pop that hood up.
Nice picks. I would also recommend Adrian Younge, such a great artist. The man is very cultured in music and I also like him as a "DJ", although I would call him a Selector.
Thanks for the rec! Listened to two albums, ">>>>>" and Kosmic Music.
Really liked the first one despite the lack of Beth Gibbons' iconic vocals.
The second one felt like a concept album, but I still listened to it three times on loop -- I have a soft spot for SpaceMusic (so much so that I moderate the quiet !SpaceMusic@lemmy.ca ) and was completely caught unaware by this album existing. So, thanks!