If you lose your phone, just have a friend send your phone a text with #playmusic in the message. Your phone will immediately begin playing music.
If
New SMS received matches search
This Trigger fires every time you receive an SMS on your Android device that matches a search you specify.
Then
Play music
This Action will play music on your Android device. The music played depends on your device and setup. Depending on your version of Android, playback may not start automatically.
Explore more great ways to automate Android Device and Android SMS