Which Alternative artist/band should you listen to? (relatively unknown)

Nostalghia: Dark, cinematic, poetic, emotional, intense.
You will not be able to stop listening if you are looking for something deep and beautifully haunting.
Try her songs God Be You, Cool for Chaos, and Sunshiny Milk to begin with.

The Birthday Massacre: Dark, fairytale-like, poetic, mature, intelligent.
This band you will become obsessed with if you are searching for deeper themes with a vibey, pretty sound, yet also heavy in some parts.

Try their songs One, Blue, and Superstition to begin with.

Digital Daggers: Intensity, electric, deep, haunting.
Their lyrics are daring and emotional, and you will become obsessed with the longing and atmosphere in their music. One of those rare bands that just do not have one bad song.
But try listening to these first:
Bleed For Me
The Devil Within
In Flames

Kate Miller-Heidke: eccentric, playful, intelligent, dreamy.
Her music exudes curiosity, imagination and honesty.
Try her songs You've Underestimated Me Dude, Humiliation and I Like You Better When You're Not Around, to get into her vibe and diversity.

The Pierces: Dreamy, Vibey, Hippie, 70s.
If you're looking for some good songs for spring and summer, these are them!

We Are Stars, The Devil Is A Lonely Night and Sticks and Stones are really great ones that you can't dislike!

Ruelle: Cinematic, intense, epic, deep.
Her music is very atmospheric and best heard with headphones in.

Game of Survival, Madness and War of Hearts are some of her strongest.

Tash Saltana: Psychedelic, rock, talented, electronic, deep.
Great songs to both dance to, or just sit still and listen in awe.

Jungle, Gemini and Salvation are flawless tracks, but then again, all of them are. She's a musical genius.

Vera Blue: vibey, alternative-pop, talented, dreamy.
She leans more towards alternative pop, but even people of the darker genres can be fascinated by her aura.

Fingertips, Private and Regular Touch show this really well.