(First of all I apologize for my awful english, Is not my main language)

Lucio is a very versatile healer.
Due to his low HOTS you should play Lucio as "specialist" like a mix of "murky" and "tracer".
Always near the enemies but always prepared tu run back and cover behind your tank / base.

For this purpose I choose the follow talents (I have played a lot of games before perfecting this build)

This is the best choice at this level.
Allow you to escape when are rounded by enemies like a butterfly

I use Soundwave very often to push enemies away from my teammate or to push TO my teammates (in order to score kills), I use this talent to widen the range.

In some case I suggest to use Subwoofer to split enemies and knock back hard

This is the only pick you could choice at this leve.
Great heals or speed support

Due to his low cooldown and his great power, this is the best "comeback" you could provide.
I've tried Sound Barrier but at the moment it provides a low barrier.

Very useful to improve Lucio defense (he has very low def untalented)

I use also Can't Stop, Won't Stop when enemies have a lot of

Sweet boost to heals

Use Heliotropics when enemy team have a lot of melee

Take this and run into enemy lines. Have fun.