In melodic-style banjo, you play scales by striking consecutive notes on different strings. With single-string style, you pick the same string consecutively, usually with an alternation of the thumb and index fingers.
Melodic G-major scale
![image0.jpg](https://www.dummies.com/wp-content/uploads/472973.image0.jpg)
Single-string G-major scale
![image1.jpg](https://www.dummies.com/wp-content/uploads/472974.image1.jpg)