Please select the most similar patent number from A, B, C and D. Which number is?
A desk-type guitar instrument playing stand, wherein a guitar support stand thereof uses a triangular support point and is attached to the ground to support and stably suspend a guitar at an adjusted position, thereby reducing a guitar holding burden of a player, maintaining a healthy sitting posture and providing a correct playing posture for a beginner; and a loudspeaker holder, which is selectively mounted and connected to an upper end of the stand, is a loudspeaker mounting means that is provided for expanding a sound field generated by a guitar instrument electroacoustic system, and saves on ground space for the player and improves instrument playability.
A: A performance method of an electronic musical instrument and music mainly comprises the steps of a), selecting a music score to be performed in an electronic music score management unit, and selecting parts to be performed and/or automatically accompanied, musical instrument types, corresponding input apparatuses, performance musical instruments, output apparatuses and standard parts, and b), starting electronic musical instruments performance apparatuses required in performing the above music score, sending performance control signals to a digital musical instrument unit to enable the digital musical instrument unit to execute corresponding performance movements or sending the performance control signals to a signal output unit under the control of a performance control unit. On the premise of satisfying the performance of musical instruments and music, the performance method of an electronic musical instrument and music that utilizes and combines with the digital characteristic of electronic music scores, electronic musical instruments and digital musical instruments, realizes a novel performance mode of musical instruments and music, simplifies the complexity of musical instrument performance and diversifies music performance modes.
B: Disclosed is a portable support frame for a musical instrument. The support frame comprises a supporting device I (1) for a handle portion of a musical instrument, and a supporting device II (2). The supporting device I (1) is movably connected to the supporting device II (2). The supporting device I (1) comprises an adjusting rod (3) with an adjustable length and a placing portion I (4) for placement of the handle portion of the musical instrument. The supporting device II (2) comprises an I-shaped supporting chassis (5), a movable adjusting frame (6) arranged above the supporting chassis (5), and a central connecting member (7). The adjusting rod (3) of the supporting device I (1) is arranged above the supporting device II (2) by means of the central connecting member (7) in an inserted manner, the bottom portion of the adjusting rod (3) extends out of the central connecting member (7), and a fixed rotary knob (8) is provided on a side face of the adjusting rod (3). The central connecting member (7) is hinged to an upper portion of the movable adjusting frame (6), placing portions II (9) for placement of the bottom portion of the musical instrument are respectively provided on two sides of the movable adjusting frame (6), and a movable clamp I (10) and a movable clamp II (11) are provided in the middle of the movable adjusting frame (6). The portable support frame uses a unique structural design, has a good supporting performance, and is convenient to fold, therefore saving on occupied space, being convenient to transport, being manufactured economically and rationally, and being suitable for popularization and application in society.
C: An interactive stringed instrument teaching system. The system is composed of an intelligent stringed instrument, a mobile terminal and a server. A Bluetooth module is mounted in both the intelligent stringed instrument and the mobile terminal. A microphone, a tuning module, a database, a teaching module and a game module are further arranged in the mobile terminal, wherein the teaching module and the game module comprise a performing module, a sound comparison module and a note determination module, and the teaching module and the game module are used for performing a current music score and using the sound comparison module to compare a collected sound with a standard sound, determining the accuracy of user performing, and guiding a user in a timely manner according to a determination result. A main control module, a sound wakeup module, an LED driving module and an LED matrix module are further mounted in the intelligent stringed instrument. According to the present invention, the learning difficulty and the threshold of a stringed instrument are reduced, and the interestingness of game learning is increased, and the system rapidly helps a primary user to truly enjoy the joy of music.
D: An electronic keyboard having three-dimensional, movably connected keyboards. A left keyboard and a right keyboard (1, 2) of the electronic keyboard may be movably connected in three dimensions; when the left keyboard and the right keyboard (1, 2) are connected in a straight line, the organ may be played by a player in a sitting position just like a conventional electronic keyboard. When the left keyboard and the right keyboard (1, 2) are connected in a vertical row, the same may be carried in the chest of the player by means of a shoulder strap (13), the player may play one keyboard with the left or right hand and the player may play the keyboard while standing still or walking; when the left keyboard and the right keyboard (1, 2) are connected longitudinally with buckles, the organ is easy to store, lift and carry; and when the left keyboard and the right keyboard (1, 2) are connected in the vertical row position, an included angle of less than 180 degrees is formed between the rear parts of the left keyboard and the right keyboard (1, 2) so as to aid in performance. The left and right keyboards connected using a soft data line both have a set of independent function keys, such as instrument selection keys (18), range adjustment keys (16) and volume adjustment push rods (21). The electronic keyboard also has a function for music on demand, wherein songs are sorted by instrument.
Answer: B