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Duane Eddy, who broke new ground in pop music in the 1950s with a reverberant, staccato style of guitar playing that became known as twang, died on Tuesday in Franklin, Tenn. He was 86.

The researchers state that auditory stream segregation may be important both for singling out a specific speaker in a crowded environment, and for clearly understanding an individual speaker in a reverberant space.

Once Mahito enters the tower — a wonderland of talking birds, unborn souls and the boy’s godlike granduncle — the score grows larger and stranger, with quirky tuned percussion, electronic effects, chorus and reverberant, cosmic orchestration.

Keaton’s performance — sly, affectionately cranky, subtly reverberant — is certainly one of “The Flash’s” highlights.

You haven’t really heard “Happy Birthday” until a Broadway chorus of 37, accompanied by 19 crack musicians, sings it in a crowded, reverberant room.