Harper Agent

Harper Agent
Feat

You gain the following benefits.
Thieves' Cant.
You know Thieves' Cant.
Instrument Training.
You gain proficiency with a Musical Instrument of your choice.
Distracting Melody.
When you take the Help action to assist an ally's attack roll, the enemy you're distracting can be within 30 feet of you, rather than within 5 feet of you, provided the enemy can see or hear you.

Source: Forgotten Realms: Heroes of Faerûn (FRHoF), page 37