To communicate band members please use the ResourceContributor composite as shown for the band U2.

Note, however, that the provision of the members of the band is not mandatory.

<SoundRecordingDetailsByTerritory>
  ...
  <DisplayArtist SequenceNumber="1">
    <PartyName>
      <FullName>U2</FullName>
    </PartyName>
    <PartyId Namespace="...">123</PartyId>
    <ArtistRole>MainArtist</ArtistRole>
  </DisplayArtist>
  ...
  <DisplayArtistName>U2</DisplayArtistName>
  ...
  <ResourceContributror>
    <PartyName>
      <FullName>Bono</FullName> 
    </PartyName>
    <ResourceContributorRole>GroupMember</ResourceContributorRole>
  <ResourceContributror>
  <ResourceContributror>
    <PartyName>
      <FullName>The Edge</FullName>
    </PartyName>
    <ResourceContributorRole>Member</ResourceContributorRole>
  <ResourceContributror>
  <ResourceContributror>
    <PartyName>
      <FullName>Adam Clayton</FullName>
    </PartyName>
    <ResourceContributorRole>GroupMember</ResourceContributorRole>
  <ResourceContributror>
  <ResourceContributror>
    <PartyName>
      <FullName>Larry Mullen, Jr.</FullName>
    </PartyName>
    <ResourceContributorRole>GroupMember</ResourceContributorRole>
  <ResourceContributror> 
</SoundRecordingDetailsByTerritory>