It depends on my mood. I find productive music to almost always lack vocals. I will list some artists and their respective albums, of the top of my head. (subgenres) Many of these artists have great discographies.
Electronic
1. Glenn Underground - Atmosfear (house)
2. Aphex Twin - Ambient Works 85-92
3. Moby - 18
4. Space Dimension Controller - The Pathway To Tiraquon6 (soul-house)
5. Boards of Canada - Music has the right to Children
6. Ulrich Schnauss - Far Away Trains Passing By
Post-Classical
1. Steve Reich - Music for 18 Musicians
2. Ólafur Arnalds - ...And They Have Escaped the Weight of Darkness
3. Max Richter - Memoryhouse
4. Nico Muhly - Speaks Volumes
Pop/Indie/Jazz
1. Royksopp - Melody AM
2. The Album Leaf - In a Safe Place
3. Sigur Ros - Agaetis Byrjun
4. Miles Davis - In a Silent Way
5. Benoit Pioulard - Lasted
Electronic
1. Glenn Underground - Atmosfear (house)
2. Aphex Twin - Ambient Works 85-92
3. Moby - 18
4. Space Dimension Controller - The Pathway To Tiraquon6 (soul-house)
5. Boards of Canada - Music has the right to Children
6. Ulrich Schnauss - Far Away Trains Passing By
Post-Classical
1. Steve Reich - Music for 18 Musicians
2. Ólafur Arnalds - ...And They Have Escaped the Weight of Darkness
3. Max Richter - Memoryhouse
4. Nico Muhly - Speaks Volumes
Pop/Indie/Jazz
1. Royksopp - Melody AM
2. The Album Leaf - In a Safe Place
3. Sigur Ros - Agaetis Byrjun
4. Miles Davis - In a Silent Way
5. Benoit Pioulard - Lasted