Ladytron

Ladytron is a cult British Synth Pop band. Originally labeled as part of the electroclash movement of the late 90s/early 00s, they have grown past that label. It consists of Helen Marnie, Mira Aroyo, Reuben Wu and Daniel Hunt.

Ladytron provides examples of the following tropes:

Bilingual Bonus: Because Aroyo was born and partly raised in Bulgaria, each album (save for their latest) has at least one song sung entirely in Bulgarian. They even did a cover of a Bulgarian rock song.
Dream Team: They have worked with and opened for a ton of fantastic artists, but perhaps the one they've toured with that's most stylistically compatible with them is Goldfrapp.
Multinational Team: A Scot, A Bulgarian, A Brit, and a Chinese guy (well, he's British-born and raised, but still). If you count the producer of their last two albums, there's also an Italian as well.
Last-Note Nightmare: "Soft Power"
Lighter and Softer: Gravity the Seducer is considerably lighter than Velocifero.
NameTron
New Sound Album: Starting with Witching Hour, the group has effectively switched up their sound with each album, whereas the first two were generally in the same style. While Witching Hour, Velocifero, and Gravity the Seducer are all synthpop, they're all different interpretations of it; WH is more of a general dream pop, borderline shoegazing affair, andVelocifero is essentially a heavily electronic New Wave Album. Gravity, on the other hand, is more of a baroque dream pop, with a bit of a cinematic flare.
Signature Song: "Destroy Everything You Touch" and "Ghosts".
Soprano and Gravel: A version of this; Marnie's voice is very airy, and relatively high, which is in stark contrast to Aroyo's deep, stern vocals.
Surreal Music Video: The music video for White Elephant.
The Pete Best: Lisa Eriksson (now part of Techno Squirrels) was a member long enough to record their first song, "He Took Her To A Movie". She sounds so much like both Marnie and Aroyo that most people (even Pitchfork in their 604 review) assume it's them singing.