The best replacement for maybe is may be.

The best alternatives to maybe are rated as following:
★★★★★  may be
★★★★  perhaps
★★  may be grammar
★★  might
★  probably
★  might be
★  possibly
★  99 problems
★  beauty and a beat
  may not be
  gangnam style
  us troops call me maybe
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  feel so close

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Speaking about maybe, one probably shouldn't forget about lyrics and chords.

Other search terms related to maybe and their ratings are:
★★★★★ lyrics and chords
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may be
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