Solo is a specialized music application designed to help guitarists and bassists master fretboard visualization through innovative practice tools. Created by renowned musicians Tom Quayle and David Beebee, this app provides a structured approach to learning note names, interval shapes, chord changes, and scales across various string instruments. Solo's unique methodology involves asking users to find specific intervallic functions against given roots or chords, ensuring mastery through interactive feedback. The app supports multiple tunings and caters to different skill levels, from beginners learning basic notes to advanced players exploring complex melodic structures. With its comprehensive training modules and customizable practice sessions, Solo transforms traditional practice routines into engaging learning experiences. Whether you're using a 6-string guitar or 5-string bass, Solo adapts to your instrument while offering duration-based workouts for optimal practice efficiency.

Solo offers an impressive suite of features designed to revolutionize fretboard mastery. Here are five standout capabilities: 1. Note Trainer - This beginner-friendly tool helps users learn note names across the fretboard with interactive diagrams and optional practice limitations for challenging exercises. 2. Interval Trainer - A powerful feature allowing players to practice any combination of intervals, create custom groups, or work on specific chord types and scales with visual guidance across the neck. 3. Changes Trainer - Users can outline intervallic functions through over 100 chord progressions with intelligent mapping and listening capabilities that track performance through complex structures. 4. Scale Trainer - Containing over 50 scales and modes, this feature enables players to break out of traditional scale boxes using intervallic functions and melodic sequence options. 5. Customization Options - The app offers extensive personalization including duration-based workouts, transposition features, and support for various tunings across different string instruments.

Solo offers numerous advantages for musicians seeking to improve their fretboard knowledge. Its key strengths include comprehensive coverage of musical elements from basic notes to complex structures, support for various instruments and tunings, and innovative intervallic function training. The app's ability to provide instant feedback and adapt to different skill levels makes it invaluable for serious practitioners. However, some users might find the interface overwhelming due to its extensive features, and beginners could struggle with the app's sophisticated methodology. Additionally, mastering the app's full potential requires significant time investment. Overall, Solo represents an exceptional resource for dedicated musicians aiming to elevate their playing skills through systematic fretboard visualization practice.