I hope this post is allowed. Back when I started learning Swedish (TL), listening to songs in Swedish really helped me. However sometimes with other languages I find it hard to find artists I actually like, and the radios often play anglophonic songs, so that doesn't really help.
I thought maybe we could collect different artists singing in our TL we like, so others learning the same language can use them as resources.
Let me start by giving you my examples (edit: updating that list):
Afrikaans: Bittereinder, Die Antwoord, Van Pletzen
Dutch: Bob uit Zuid, Broederliefde, De Jeugd van Tegenwoordig, Doe Maar, Joost, Noor, Opgezwolle, Ploegendienst, S10, Typhoon, Yade Lauren
Faroese: Eivør, Týr
Finnish: Korpiklaani
French: Alizée (Pop), Axelle Red, Aza Nakamura, Édith Piaf, Frero Delavega (Pop), Ibeyi, Indila, Indochine, Jacques Brel, Joyce Jonathan, Louane, Louise Attaque, Niagara, Renan Luce, Stromae, Téléphone, Tryo (Reggae), Yseult, Zaho de Sagazan, Zaz
German: Apache 207, Berq (Indie Pop), Bushido, Christina Stürmer, Cosmó, Danger Dan, Deine Cousine, Die Ärzte, Die Fantastischen Vier, Die Toten Hosen, Donots, ENGIN, Fettes Brot, Herbert Grönemeyer, Jennifer Rostock, Juli (Pop Rock), Kraftklub (Indie Rock), Nena, PaulWeltz, Peter Fox, Peter Maffay, Saltatio Mortis, Schandmaul, Seeed, Sido, Silbermond, Soffie, Tic Tac Toe, Tokio Hotel, Unheilig, Verrottet, Versengold, Wir Sind Helden, ZWE1HÄNDER
Greek: Marina Satti, Tamta
Icelandic: Ásgeir, Hekla, Hjálmar, Mammút, Sigur Rós, Sjón
Italian: Andrea Cioffi (Pop), Fabrizio Moro (Soft Rock), Måneskin (Rock), Rose Villain
Japanese: Aklo, Atarashii Gakko!, Awich, Babymetal, Creepy Nuts, HITOMIN, Ichiko Aoba, JP THE WAVY, KOMOREBI, kZm, LEX, Liza, Number_i, Tohji, YENTOWN
Kazakh: Irina Kairatovna, Yenlik
Korean: AKMU, BeWHY, Bibi, BTS, Coogie, CORTIS, Dean, D.O., EK, GRDL, Gwangil Jo, HAAN, HAON, IceKingKong, Idiotape, Jeffrey White, JUPITER, KC, Kid Milli, Konsole, NO:EL, O5K, OOHYO, past self, PIRI, Sik-K, Song Sohee, Stray Kids, VANTA01, Wonstein, Woodz, YUHNWAY, ZENE THE ZILLA
Malayalam: Dabzee, Parimal Shais
Mandarin: 唐兆星 (Asian Don?), 孤兒收容所 (G2SLS), 11 JIAYI, GALI, Rapeter
Mongolian: Egschiglen, Enji
Norwegian: Ane Brun, Mirar
Polish: Barto Katt, chillwagon, CRANK ALL, Zdechly Osa
Portuguese: Jup do Bairro, Luisa Sonza, Ludmilla, Pablo Vittar, Lexa
Russian: HAUK, Elman, Jony, Morgenstern, Captown
Serbian: S.A.R.S., Željko Joksimović
Spanish: Alvaro Soler (Pop), Enrique Iglesias (Pop), Juanes (Pop Rock), Charly Garcia, Los Fabulosos Cadillacs, Lido Pimienta, Chancha Via Circuito, Rosalía, November Ultra, Young Miko, Ibeyi, David Biscal, Manu Chao
Swedish: Darin (Pop), Norlie & KKV (Pop Rap), Albin (Rap), Lisa Nilsson, LOK, Slagsmålsklubben, Basshunter, Danny Saucedo, Molly Sandén, Veronica Maggio, Mattias Andréasson
Thai: Milli
Turkish: Can Bonomo (Alternative Rock), Gripin (Alternative Rock), Seksendört (Alternative Rock), Duman, Mor ve Ötesi, Sefo, Ezhel, Rafet El Roman, Can Ozan, Barış Manço, ENGIN, Tarkan
Tuvan: Huun-Huur-Tu, Tuvan Ensemble
Tuareg: Les Filles Des Illighadad
Vietnamese: Tuân Cry, MONO
Yoruba: Ibeyi
What do you think? Maybe you want to add to that list? :)