Crescendo

Bolstered with magic, your music amplifies the power of the companions that can hear you.  Choose one ability between Strength, Dexterity, Constitution, Intelligence, Wisdom, or Charisma.  At the start of each of your turns, for the duration of the spell, you and all of your allies that are within 30 feet of you get a +1 to this ability modifier (up to a maximum of +3).  That bonus lasts until the spell ends or until he ally ends its turn more than 30 feet away from you.

When an ally (or you) get the maximum bonus, it also gains one of the following benefits, according to the ability you chose:

• Crescendo of Strength: Your carry capacity is doubled and you can grapple creatures that are 2 sizes larger than you.
• Crescendo of Dexterity: Your speed is increased by 10ft.
• Crescendo of Constitution: When you should take damage, you take 3 less damage.
• Crescendo of Intelligence: You can add your Intelligence modifier to the damage roll of your cantrips.
• Crescendo of Wisdom: You gain truesight within a 10 foot range.
• Crescendo of Charisma: You can take the Help action as a bonus action.