You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "mr keen tracer of lost persons theme song?" whose answer is Someday I'll Find You.
Each document should contain about 30 words, and these documents should contain useful information.

Query: theme song for Mr. Keen, Tracer of Lost Persons
Useful Output:

Doc 1: But the familiar title, and its theme song, “Someday I'll Find  RADIO. MR. KEEN, TRACER OF LOST PERSONS (1937, NBC Blue; 1947, CBS)
Doc 2: View credits, reviews, tracks and shop for the 1975 Vinyl release of "Mr. Keen Tracer Of Lost Persons" on Discogs.
Doc 3: Al Rickey's band provided the background music, including the program's theme, "Someday I'll Find You." (source: wikipedia). You are WELCOME
Doc 4: “Saints preserve us, Mr. Keen! He's got a gun!” · By Ivan G Shreve Jr · Mr. Keen, Tracer of Lost Persons originated in the daytime drama factory
Doc 5:  Soundtrack for your Chesterton Day! Our 24/7 Live Stream - Elfland Radio is here: http://Listen.ChestertonRadio.com Your support is the only