IDMT-SMT-Chords Dataset
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The IDMT-SMT-CHORDS comprises of 16 MIDI generated audio files consists of various chord classes. Here we focused on chord voicings, which are commonly used on keyboard instruments and guitars. Based on this we categorized as Guitar and Non-Guitar instruments. We used several software instruments from Ableton Live and Garage Band to synthesize these MIDI files with various instruments such as piano, synthesizer pad, as well as acoustic and electric guitar. File duration: 4.1 Hours # Chord segments: 7398 # WAV files: 16 Chord duration: 2 seconds BPM: 120 Time signature: 4/4 Sampling rate: 44.1KHz Mono audio Non-Guitar The Non-Guitar files includes all chord types in all possible root note positions and inversions. For example, C Major triad chord is included with its two possible inversions C/E and C/G. All non-guitar chord classes are listed below: Major (+ 2 inversions) Minor (+ 2 inversions) Major 7 (+ 3 inversions) Minor 7 (+ 3 inversions) Power Chord - root and fifth note (+ 1 inversion) Dominant 7 (+ 3 inversions) Minor 7 flat 5 (+ 3 inversions) This gives us 576 non-guitar chord classes. Guitar The guitar files where generated based on barŕe chord voicings with the root note located on the low E, A, and D strings. For example, to modeling major chord and it’s voicings we use open position E maj, A maj and D maj shape and move 12 steps (including octave at 12th fret) thereby we get 39 positions (13*3). List of Guitar chord types: Major (+ 2 voicings) Minor (+ 2 voicings) Major 7 (+ 2 voicings) Minor 7 (+ 2 voicings) Power Chord - root and fifth note (+ 2 voicings) Dominant 7 (+ 2 voicings) Minor 7 flat 5 (+ 2 voicings) This gives us 273 different guitar chord classes.
IDMT-SMT-CHORDS数据集由16个由乐器数字接口(MIDI)生成的音频文件构成,涵盖多种和弦类别。本数据集聚焦于键盘乐器与吉他常用的和弦指法(chord voicings),并据此将数据集划分为吉他类与非吉他类乐器两个子集。我们采用Ableton Live与Garage Band中的多款软件合成器,将MIDI文件合成为钢琴、合成器铺底音色、原声吉他与电吉他等不同乐器的音频。 文件总时长:4.1小时;和弦片段总数:7398;WAV文件总数:16;单和弦时长:2秒;节拍速度(BPM):120;拍号:4/4;采样率:44.1kHz;音频格式:单声道(Mono audio)。 非吉他类子集 非吉他类音频文件包含所有和弦类型在所有可能根音位置与转位下的样本。例如,C大三和弦包含其两种可能的转位:C/E与C/G。所有非吉他类和弦类别列表如下: 大三和弦(含2种转位)、小三和弦(含2种转位)、大七和弦(含3种转位)、小七和弦(含3种转位)、强力和弦——仅根音与五音(含1种转位)、属七和弦(含3种转位)、小七降五和弦(含3种转位)。 经统计,非吉他类和弦类别总计576种。 吉他类子集 吉他类音频文件基于横按和弦(barre chord)指法生成,根音分别位于低音E弦、A弦与D弦上。以大三和弦及其指法为例,我们采用开放把位的E大调、A大调与D大调和弦指法,并将其在指板上移动12个半音(含12品的八度音),由此得到39种指法位置(13×3)。吉他和弦类型列表如下: 大三和弦(含2种指法)、小三和弦(含2种指法)、大七和弦(含2种指法)、小七和弦(含2种指法)、强力和弦——仅根音与五音(含2种指法)、属七和弦(含2种指法)、小七降五和弦(含2种指法)。 经统计,吉他类和弦类别总计273种。




