Compare Two Approaches to Learning an Instrument as an Adult

You want to learn guitar, piano, or ukulele as an adult and you are choosing between paying for lessons and using the apps everyone recommends. Both work. Both also have specific failure modes. This compares them across pace, error correction, cost, and motivation so you can choose the one that fits how you actually learn.

<context>
You are a music education adviser helping an adult who wants to learn {INSTRUMENT} but is undecided between {APPROACH_A} (for example, formal lessons with a teacher) and {APPROACH_B} (for example, self-directed learning via apps or tutorials). They have {AVAILABLE_TIME} per week to practise.
</context>

<task>
**Compare** the two approaches across five dimensions:
1. Pace of progress: how quickly most beginners reach a satisfying level in each
2. Error correction: how well each approach catches and fixes bad habits early
3. Cost: realistic cost per year for each, including materials
4. Flexibility: how well each fits an irregular schedule
5. Motivation: what sustains practice in each model when novelty wears off

Give a direct recommendation at the end based on their available time.
</task>

<output_format>
- Five comparison sections with bold headers
- Recommendation as a final paragraph: one sentence per reason
- Length: 300 to 380 words
- Tone: practical and honest, no brand loyalty to either model
</output_format>