1. A method for phonetizing text-containing data records ( 2 ) that include graphemes, and which are stored in a first storage, by a voice-controlled user interface at a vehicle having a computation device ( 4 ) having (a) a first computation unit ( 5 ), and (b) a second computation unit ( 6 ), the first and second computation units being configured to operate in parallel with one another, the second computation unit ( 6 ) having a voice recognition unit, and wherein the data records comprise music information, the method comprising: the voice-controlled user interface generating phonetized data lists ( 8 ) by converting graphemes in the data records ( 2 ) stored in the first storage into phonemes, and storing, in a second storage, the phonemes as the phonetized data lists ( 8 ), the generating comprising: breaking down the data records ( 2 ) present as graphemes into grapheme subpackets, wherein a length of a grapheme subpacket is determined by an optimum ratio dependent on the first computation unit ( 5 ), for a volume of data in the grapheme subpacket to a messaging overhead that arises from the communication between the first and second computation units ( 5 , 6 ), wherein the message overhead represents the computational power of the first and second computation units based on the grapheme subpackets that are interchanged between the first and the second computation units; preprocessing, by the first computation unit ( 5 ), the graphemes to condition the graphemes for the phonetization by modifying the grapheme subpackets on a language-defined and/or user-defined basis, converting, by the second computation unit ( 6 ), the preprocessed grapheme subpackets into phonemes, wherein the preprocessing of the grapheme subpackets and the conversion of the grapheme subpackets into phonemes are performed in parallel on the first and second computation units ( 5 , 6 ); receiving user speech for identifying a selection of music; performing, by the voice recognition unit, voice recognition on the received speech based on the converting of the preprocessed grapheme subpackets into phonemes, wherein the voice recognition unit is located at the second computation unit; and playing back, at the vehicle, a music track based on the recognized speech and the converted grapheme subpackets.