Historical clue formulations

• ... for a musician? — 2015-06-22
• Brings into harmony — 2011-07-12
• Synchronizes — 2011-04-07
• Gets in sync — 2009-05-29
• Adapts — 2009-01-16
• Puts on the right wavelength — 2003-09-27
• Harmonizes — 2001-10-25
• Puts into harmony — 1999-01-25