Radio Mirror Park

George Lewis Jr., using his pseudonym Twin Shadow, voiced himself (i.e., a DJ at Radio Mirror Park, which specializes in indie music).

Songs from this radio station can be heard in the game (missions are indicated in brackets, more precisely, the endings of the latter):

Yeasayer - Don't Come Close (Something Sensible).
The Chain Gang Of 1974 - Sleepwalking (The Time's Come).
Favored Nations - The Set Up (The Third Way).

The C90's - Shine A Light [Flight Facilities Remix] (plays in the mission Did Somebody Say Yoga?, during Michael's hallucinations).

Dan Croll - From Nowhere [Baardsen Remix] (can be heard in the trailer for the Xbox One/PS4/PC versions of the game).

Don't forget about GTA Online:
Neon Indian - Change Of Coast is the main theme of Grand Theft Auto Online.

Hot Chip - Flutes plays in the trailer for the GTA Online: Cunning Stunts DLC.

Battle Tapes - Feel The Same plays in the trailer for the GTA Online: Import/Export DLC.

Tracklist:
01-Dom — Living In America
02-Poolside – Do You Believe?
03-Panama — Always
04-Holy Ghost! — Hold On
05-DJ Mehdi - Lucky Boy [Outlines Remix]
06-Cut Copy — Strangers In The Wind
07-Neon Indian - Polish Girl
08-Black Strobe - Boogie In Zero Gravity
09-Yeasayer — Don't Come Close
10-Health - High Pressure Dave
11-Tony Castles - Heart In The Pipes [KAUF Remix]
12-Scenic — Mesmerised
13-Age Of Consent - Colors
14-Toro y Moi - New Beat
15-Age Of Consent — Heartbreak
16-Little Dragon - Crystalfilm
17-KAUF — When You're Out
18-Twin Shadow — Shooting Holes
19-Neon Indian - Change Of Coast
20-Living Days - Little White Lie
21-The C90's - Shine A Light [Flight Facilities Remix]
22-Dan Croll - From Nowhere [Baardsen Remix]
23-Yeasayer - O.N.E.
24-Twin Shadow – Old Love-New Love
25-Mitzi - Truly Alive
26-Jai Paul — Jasmine [Demo]
27-Nite Jewel - Nowhere To Go
28-Hot Chip - Flutes
29-Battle Tapes - Feel The Same
30-The Ruby Suns - In Real Life
31-Miami Horror — Sometimes
33-The Chain Gang Of 1974 - Sleepwalking
34-Yacht – Psychic City [Classixx Remix]
35-Feathers - Dark Matter
36-SBTRKT Feat. Roses Gabor - Pharaohs
37-!!! — One Girl — One Boy
38-Niki And The Dove - The Drummer
39-Toro y Moi – So Many Details
40-Favored Nations — The Set Up

Twin Shadow makes several references to the connection between locations from GTA and their real-life prototypes.
During the announcement of the song Battle Tapes - Feel The Same, he comments, "From here in Los Santos." Battle Tapes is based in Los Angeles, California (Los Angeles is the inspiration for Los Santos).
During the announcement of the song Yeasayer - Don't Come Close (in all versions of the game), he comments that it is "psychedelic pop from Broker". Yeasayer is based in Brooklyn, New York (thus, this New York borough is the prototype of the Broker).
In the game files, the radio is listed as "silverlake", a reference to the Silver Lake neighborhood of Los Angeles (on which Mirror Park is based), an area known for its hipsters and indie music scene, reinforcing the station's connection to the hipster subculture. The frequency, 88.9 FM, is also the frequency of KXLU, a Los Angeles radio station that broadcasts from Loyola Marymount College and plays independent music and demos from emerging artists.