The phrase "allow to harmonise" is not correct as it is missing a subject or object.
You can use it in contexts where you want to express permission for something to come into harmony, but it needs to be rephrased for clarity.
Example: "We need to allow the different departments to harmonise their efforts for better collaboration."
Alternatives: "permit to harmonise" or "enable to harmonise".
Marvin Gaye, having been consumed by poor Tammi's death, wisely chooses to eschew singing buddies and use the benefits of modern technology to allow him to harmonise with himself throughout the 1970s.
"An RFU takeover would allow it to harmonise refereeing, so that the breakdown was no longer a surprise for English players in the Test arena, and they could play with the intensity Eddie Jones wants.
From the data modelling point of view, the adoption of the CityGML standard for urban data modelling grants an open, powerful, flexible and extendable solution which allows to provide harmonised and homogeneous data to the simulation tools, regardless of the original data formats and origin.
To take advantage of this, Parsons perfected the use of studio techniques such as the double tracking of vocals and guitars, which allowed Gilmour to harmonise with himself.
GRIM news for those, like Gulliver, who relish the fact that aeroplanes provide an escape from ringtones and phone conversations: the European Commission has agreed to harmonise technology and licensing standards to allow mobile-phones to be used across its airspace.
It said that the purpose was to harmonise the retention of traffic data to allow criminal investigation.
Last week's decision by the IOC to pass the buck to the 28 International Federations – allowing them to decide which Russians are allowed into Rio – is surely counter to the Wada Code, which was set up to harmonise decisions on doping issues across countries and sport.
Meanwhile, Ofcom intends to "harmonise" the disparity between the amount of TV advertising allowed each hour on public service broadcast channels, such as ITV, and on digital channels such as BSkyB.
"The girls", as their manager Sam calls them, were allowed to drink for the first time in three weeks, and they made the most of it, resulting in them harmonising Vybz Kartel songs and assorted dancehall and R&B tracks at the tops of their voices in the post-ceremony cab.
Efforts should be made to harmonise notifiable disease registries, laboratory methods and clinical surveillance definitions across administrative jurisdictions to allow comparable disease reporting and analysis.
France and Germany plan to harmonise their national legislation on key subjects like family and civil law; to hold joint cabinet meetings on a regular basis; to allow their citizens dual French/German nationality; and to develop "common positions" in economic policy.
