Problem: The Tlingit language (English: , ; Tlingit: Lingit [linkit]) is spoken by the Tlingit people of Southeast Alaska and Western Canada. It is a branch of the Na-Dene language family. Extensive effort is being put into revitalization programs in Southeast Alaska to revive and preserve the Tlingit language and culture. Missionaries of the Russian Orthodox Church were the first to develop a written version of Tlingit, using the Cyrillic script to record and translate it, when the Russian Empire had contact with Alaska and the coast of North America down to Sonoma County, California.

Tlingit has eight vowels, four vowels further distinguished formally by length. However, the length distinction is often in terms of tenseness rather than length, particularly in rapid speech. For the Northern dialect, the dominant spoken dialect of Tlingit and the standard for written Tlingit, every vowel may take either high or low tone; in the orthography high tone is indicated by an acute accent, e.g. aa, and low tone is unmarked, e.g. aa. The Southern and Transitional dialects have a mid tone which is unmarked and additional low tone which is marked by a grave accent, e.g. aa. As noted in the vowel chart above, there is an allophone of /a:/ (orthographic aa) which is realized as [a:] under the influence of uvular consonants, however this is not consistent for all speakers. The backness influence arises from articulation with uvular consonants, thus the word khaa "person" is often spoken as [qha:], whereas the word (a) kaa "on (its) surface" is said as [(?^) kha:] by the same speakers. Word onset is always consonantal in Tlingit, i.e. no word may begin with a vowel. Where one would occur theoretically by e.g. prefixing or compounding, the vowel is obligatorily preceded by either [?] or [j]. The former is universal in single words, and the latter is found varying with [?] in word-medial position in compounds. The orthography does not reflect the [?] in word-initial position, but either . or y may be seen in medial position. For example, the word khoowat'aa "the weather is hot" (khu-yu-ya-t'aa, INDH.OBJ-PERF-(0, -D, +I)-hot) is phonetically [qhu:w^t'a:], but when the perfective prefix yu- is word initial in uwat'aa "it is hot" (0-yu-ya-t'aa, 3NEU.OBJ-PERF-(0, -D, +I)-hot) the phonetic form is [?Uw^t'a:] where the glottal stop appears to ensure that the word begins with a consonant.

what are vowels?

Answer with quotes: Tlingit has eight vowels,

Problem: Autechre () are an English electronic music duo consisting of Rob Brown and Sean Booth, both from Rochdale, Greater Manchester. Formed in 1987, they are one of the most popular acts signed to UK electronic label Warp Records, through which all of Autechre's full-length albums have been released beginning in 1993 with Incunabula. They have also worked closely with the label Skam. The music of Autechre has shifted gradually throughout their career, from their earlier work's roots in techno, electro, and hip hop to later albums often considered experimental in nature, featuring complex drum programming, subdued melodies, and few stylistic conventions.

The new millennium brought about a drastic change in Autechre's style, demonstrated by Confield (2001) and Draft 7.30 (2003), as well as the Gantz Graf EP (2002). The title track from Gantz Graf inspired an iconic video by British designer Alex Rutterford, featuring an object (or an agglomeration of objects) synchronized to the music as it morphs, pulsates, shakes, and finally dissolves. Rutterford, who had previously created an unofficial video for the Tri Repetae track "Eutow" as part of the Channel 4 music programme Lo-Fi in 2001, claimed the idea for the "Gantz Graf" video came during one of his LSD trips. The second Autechre Peel session EP was also released in 2002, containing four tracks broadcast in 1999, named by John Peel himself. Autechre released two collaborative albums with Andrew M. McKenzie's Hafler Trio collective during the following three years (see collaborations). The reactions by both professional critics and fans to the release of Confield were mixed, though generally positive. According to Sean Booth, "most of Confield came out of experiments with Max that weren't really applicable in a club environment." In contrast, 2003's Draft 7.30 was seen by some as an easier record to grasp. Booth stated in an interview around the release of Draft 7.30 that "[rhythm] doesn't seem to limit us in the way it did when we first started. Now I think we just get it, we're totally fluent in it and can be more expressive." Untilted (a play on the word "untitled"), the duo's eighth album, was released in 2005. It roughly continued the sound of their previous two LPs, though featured compositions that mutated greatly during their duration, typically alternating between passages of ambience and heavily processed, precise beats, such as on "Ipacial Section". Its final track, "Sublimit", is at almost sixteen minutes Autechre's longest composition to feature on any of their albums until 2016's elseq 1-5. The release of Untilted was followed by a two-month tour that took the group around Europe, America and Japan, but withdrew them from studio work for an unusual length of time. The outcome of this, coupled with a forced change in studio setup, was a gap of three years between releases, longer than ever before.

What lead to the drastic change?

Answer with quotes:
The title track from Gantz Graf inspired an iconic video by British designer Alex Rutterford, featuring an object (or an agglomeration of objects) synchronized to the music