I listen to a lot of instrumental music.
My favorite group of all-time is Godspeed You! Black Emperor, who only feature various spoken word clips. I also like a good amount of the side projects of the group's members, like Set Fire to Flames and Le Fly Pan Am.
<spoiler=GYBE>
A lot of post-rock in general doesn't feature vocals. Tortoise, Explosions in the Sky, Do Make Say Think, Mogwai, Stars of the Lid, and Mono are a few of my favorite groups in that (very loosely defined) genre.
<spoiler=Post-rock>
I also got really into drone and noise last summer, and my absolute favorite album of that year was Chris Rehm's Salivary Stones, which featured only one song with vocals. I had driven from New Jersey to Miami and back in a car with no tape/cd player about four or five times between 2003 and 2005 (which I remember being the first truly liberating experience of my life), and this reminded me of listening to a good radio station until it was nothing but static.
<spoiler=Chris Rehm>
At this point, I'm assuming it's safe to keep reiterating the music's lack of vocals.
In the early 90s, there was a subgenre in the techno scene which produced some of my favorite albums of that time period. The KLF's Chill Out, Aphex Twin's Selected Ambient Works 85-92, Global Communication's 76:14, and Boards of Canada's Music Has the Right to Children all are near-entirely vocal free, save a few scattered samples. Chill Out particularly resonated with me after my trips from NJ-FL, since the album is conceived as a road trip along the Gulf of Mexico.
While I'm here, I might as well mention the original ambient artist, Brian Eno. Most of his albums after 1978 haven't featured much by way of voice.
<spoiler=Ambient Techno>
Also in the 90s was the atrociously-named electronic genre IDM. It's the genre that was responsible for me opening my mind up to more music than the silly punk music I was obsessed with around the year 2000 (plus, you know, the internet helped). Some of these albums still rank as my favorites: Autechre's Tri Repetae, Matmos' A Chance to Cut Is a Chance to Cure, µ-Ziq's Lunatic Harness, and Squarepusher's Hard Normal Daddy. It also include one of the most bizarrely beautiful songs I've ever heard, Nobukazu Takemura's Icefall.
<spoiler=Remember, Only Stupid People Call It Intelligent>
Jazz. All jazz. If it has vocals, it's not real jazz. Not much else I can really say. Favorites: Thelonious Monk's Brilliant Corners, Miles Davis' Birth of the Cool, John Coltrane's Giant Steps, and Art Tatum's consistent ability to make me shit myself.
I'll just end it here, or else I'll be here all night. I listen to a lot of music.
