Deep house is known for tempos typically from 110 to 125 BPM,deep muted basslines (typically using a Roland Juno synthesizer), spacious use of percussion elements (typically using a Roland TR-909 drum machine), soft keyboard sounds (pads), use of advanced chord structures, ambient mixes, and soulful vocals. Lyrics usually focus on positive/uplifting or forlorn modern blues lyrics. In the early compositions (1986–89), influences of jazz music were most frequently brought out by using more complex chords than simple triads (7ths, 9ths, 13ths, suspensions, alterations) which are held for many bars and give compositions a slightly dissonant feel. The use of vocals became more common in deep house than in many other forms of house music. Sonic qualities include soulful vocals (if vocals are included), slow and concentrated pleasantly dissonant melodies, and a smooth, stylish, and chic demeanor. The use of women's vocals is more common than males in deep house tracks.