Final answer:
The technique for playing blues notes on a guitar without a bottleneck is called sliding.
Step-by-step explanation:
The technique for playing blues notes on a guitar without a bottleneck is called sliding. Sliding involves using a finger or a guitar pick to slide along the string, creating a smooth and expressive sound. To play blues notes, you can slide your finger up or down the fretboard to reach the desired pitch, adding a characteristic bluesy feel to your playing.