pedal notes are a resource regularly used in both popular music and classical music. Generally give a feeling of static on which to pass other parts of a more dynamic. An instrument pedal notes issued by definition, would be a bagpipe, which emits a pedal note character through a long tube, while another tube with holes like a flute, is responsible for issuing melodies on it. In
guitar, pedal notes generally allocated to the open strings, for the facility to keep playing and do different fingerings in the rest of the strings. In Ex.1 see a simple case of melody and pedal note:
The note my grave, gives a sense of tone, which together with the melody that makes us think we see in E minor chord. In general, pedal note refers to the keynote when it comes to the key of a song. Another case, but less clear is given in "Blackbird" by Lennon and McCartney (Ex.2):
Here the selected note is sun on the third string open, which is maintained throughout the song. The issue is written in G major, but that note sun not being the lowest note, is acquiring a different character to the changes of low (bass note). In the first bar, first time, the sun meets the note G chord, but the latter acts as seventh Am, forming unAm7, the third time back to the tonic with a G / B and G continues in the second compass.
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