###Unfortunately, No###

The introduction to Xanathar's Guide to Everything (page 5) reiterates a rule about concentration:

As soon as you start casting a spell or using a special ability that requires concentration, your concentration on another effect ends instantly.

Therefore, any spells/abilities that require concentration to maintain end when another spell or ability that also requires concentration is cast.

Unfortunately, No

The introduction to Xanathar's Guide to Everything (page 5) reiterates a rule about concentration:

As soon as you start casting a spell or using a special ability that requires concentration, your concentration on another effect ends instantly.

Therefore, any spells/abilities that require concentration to maintain end when another spell or ability that also requires concentration is cast.

###Unfortunately, No###

Xanathar's Guide to Everything (page 5) states:

As soon as you start casting a spell or using a special ability that requires concentration, your concentration on another effect ends instantly.

Therefore, any spells/abilities that require concentration to maintain end when another spell or ability that also requires concentration is cast.

###Unfortunately, No###

The introduction to Xanathar's Guide to Everything (page 5) reiterates a rule about concentration:

As soon as you start casting a spell or using a special ability that requires concentration, your concentration on another effect ends instantly.

Therefore, any spells/abilities that require concentration to maintain end when another spell or ability that also requires concentration is cast.